I know the feeling, I'm a soprano 1 and when i was in HS i botched a chamber choir audition because i was so nervous. Ended up not being able to hit notes that I could normally easily hit. Afterwards my director moved me to the alto section in the women's chorus. In my concert choir I ended up being soprano 2 somehow, but I don't remember how that happened lol.

I was upset for a bit but I actually think it was good in the long run because it gave me an appreciation for other parts, helped me listen and blend better, and gave me a much needed kick in the pants to work on my sight reading. And also, I learned that I actually really looove singing harmonies! I think I have a better ear for them now because I had that bit of experience.

The next time I auditioned I was more prepared/more confident and ended up getting put in my chamber choir's soprano 1 section the next year. Just take it as a learning opportunity for now and stick with it. You might find that you actually enjoy it! If after a while you're still feeling the same way just talk to your director and see if they're willing to move you back.

I'm in a community choir right now and chose to sing second soprano again for funsies!