Narrative:

I am a student pilot. I was in line for takeoff at okeechobee; fl; an un-towered field. When I first lined up there were 5 planes in line for takeoff not including myself; along with a pretty clobbered pattern. I started getting a little nervous. It eventually gets to be my turn; and I turn my plane short of the hold-short line towards the final leg to watch for traffic. One plane lands; and I immediately spot another on final; so I wait for it as well. This plane lands; and I do not see another plane on final; so I turn to watch the plane that just landed. This plane taxis all the way down the runway before turning off; contributing to my impatience to depart. By the time this plane exits the runway; I have heard a call for a final turn and see the plane on approach. This plane lands; and I hear another plane call a base turn. At this point someone else; I assume someone behind me suggests I lineup and hold on the runway to expedite departure. This makes me feel even more impatient; like I'm holding all of these people up. The landing plane departs the runway promptly; so I begin rolling out to the runway; over the hold-short line. As I'm rolling out to the runway; I hear a call for a final turn. I hadn't called for entering the runway yet due to a clobbered frequency so I make that call. At this point; I hadn't seen anyone on the final or base leg just earlier; so I'm almost rolling onto the runway; so I elect to depart; as I believe the traffic that just called final is adequately far back.at this point I'm recalling the experience I had on my initial approach to this same field; where a plane lined up and held on the runway as I was turning final; and held until I was nearly on short final before departing. I figured this kind of close-in traffic is the way a super-busy uncontrolled airspace is (I typically fly out of tix; a controlled field). I understand now; that that should not be the case (lining up and holding prevents the PIC from seeing traffic behind them to a large degree...)as I hit my takeoff speed; I see a yellow biplane appear off my right; 100 to 200 feet up; having apparently been on short final when calling final. This is my first time at this airfield and have never performed a high-speed takeoff abort; so at this point I elect to continue flying and divert slightly left to provide space; but continue on heading so as to not-complicate the situation further. I continue out and depart the airspace; unclear where the biplane deviated off of my right side. At that point I was highly upset.I believe the combination of factors contributed to my choice to take off. First being my experience on approach to the airfield; where I got uncomfortably (for me) close to departing traffic which was holding on the runway while I was on my final leg. Second was my overall nerves; I hadn't been to this airfield before; and had not experienced this amount of traffic before either. Thirdly; the people behind me calling (seemingly) impatiently for my departure. Finally; my assumption about the position of the traffic making radio calls.as far as corrective actions; I will no longer let other people and pressure affect my decision to depart. Additionally; I will even more earnestly visually verify the position of traffic in the pattern. Finally; if I ever feel uncomfortable departing in a clobbered pattern like that; I will request that traffic in pattern extend the downwind to give me a little extra time.

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Original NASA ASRS Text

Title: C150 student pilot reported a NMAC occurred on takeoff from OBE; a non-tower airport.

Narrative: I am a student pilot. I was in line for takeoff at Okeechobee; FL; an un-towered field. When I first lined up there were 5 planes in line for takeoff not including myself; along with a pretty clobbered pattern. I started getting a little nervous. It eventually gets to be my turn; and I turn my plane short of the hold-short line towards the final leg to watch for traffic. One plane lands; and I immediately spot another on final; so I wait for it as well. This plane lands; and I do not see another plane on final; so I turn to watch the plane that just landed. This plane taxis all the way down the runway before turning off; contributing to my impatience to depart. By the time this plane exits the runway; I have heard a call for a final turn and see the plane on approach. This plane lands; and I hear another plane call a base turn. At this point someone else; I assume someone behind me suggests I lineup and hold on the runway to expedite departure. This makes me feel even more impatient; like I'm holding all of these people up. The landing plane departs the runway promptly; so I begin rolling out to the runway; over the hold-short line. As I'm rolling out to the runway; I hear a call for a final turn. I hadn't called for entering the runway yet due to a clobbered frequency so I make that call. At this point; I hadn't seen anyone on the final or base leg just earlier; so I'm almost rolling onto the runway; so I elect to depart; as I believe the traffic that just called final is adequately far back.At this point I'm recalling the experience I had on my initial approach to this same field; where a plane lined up and held on the runway as I was turning final; and held until I was nearly on short final before departing. I figured this kind of close-in traffic is the way a super-busy uncontrolled airspace is (I typically fly out of TIX; a controlled field). I understand now; that that should not be the case (lining up and holding prevents the PIC from seeing traffic behind them to a large degree...)As I hit my takeoff speed; I see a yellow biplane appear off my right; 100 to 200 feet up; having apparently been on short final when calling final. This is my first time at this airfield and have never performed a high-speed takeoff abort; so at this point I elect to continue flying and divert slightly left to provide space; but continue on heading so as to not-complicate the situation further. I continue out and depart the airspace; unclear where the biplane deviated off of my right side. At that point I was highly upset.I believe the combination of factors contributed to my choice to take off. First being my experience on approach to the airfield; where I got uncomfortably (for me) close to departing traffic which was holding on the runway while I was on my final leg. Second was my overall nerves; I hadn't been to this airfield before; and had not experienced this amount of traffic before either. Thirdly; the people behind me calling (seemingly) impatiently for my departure. Finally; my assumption about the position of the traffic making radio calls.As far as corrective actions; I will no longer let other people and pressure affect my decision to depart. Additionally; I will even more earnestly visually verify the position of traffic in the pattern. Finally; if I ever feel uncomfortable departing in a clobbered pattern like that; I will request that traffic in pattern extend the downwind to give me a little extra time.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.