I cant ride a bike and im going on a biking trip soon?

[PeterGriffin]

im 15 i cant ride a bike i think im pathetic for this and i took GCSE pe up and i learned that we will be going on a biking trip as part of it so i felt really embarrassed since i cant ride them but before this i was asked if i wanted to go on a biking trip and for some reason i said yes the next day i get to where we were going and i fall off straight away quite simply the most embarrassing moment of my life even though my friends wernt taking the **** while on the trip i kinda got the hang of it after about 30 minutes and am now ok at pushing off and then riding the only problem i have is going over bumps on roads and paths soon as i go over one im off it took us 4 hours to get to where we were going so we didnt have long to ride around and as i said we are doing a assessment where we were on bikes so i dont really see how we can get there and back without wasting the whole school day i think my teacher is purposely trying to embarrass me because even though at the trip he fell off and knocked himself out for a few seconds and we wont have enough time to go there and back in the 2 hours of pe i have on some days he still made plans for it and told loads of people i dont even know at the school.

i dont know what to do i cant change lessons anymore so im thinking about pretending to fall back in the lesson to get out of the mess im in. i know im going to have to learn at some point because if i have kids how are they supposed to learn if i dont know myself but i dont see it as a essential skill in life.

a little support or a answer on something i could do about it would be nice dont say find a field where i can practice because i live near no fields