Hi ShiroKuro
Just listened to your recording and it sounds fine to me. Not perfect, but it'll never be!
I played at my Teachers recital this year, where like you I was the only adult, the rest were children/teenagers. I actually quite liked that situation. My performance was nowhere near perfect, and I certainly made mistakes. And if you make a mistake, or even if you come to a complete stop, it's not the end of the world. Just gather yourself and carry on.
I assume you are playing from music? I wouldn't try doing it from memory. At my recital everybody played from music. If playing from memory was required I wouldn't have been there.
At my teacher's previous years recital I played Maple Leaf Rag and I had it almost completely memorised, because I've played the piece for decades. However I had very little practise prior to the recital because my Mum had died a few weeks earlier. I got 3/4 way through playing it from memory (but with music in front of me) and then went blank. I didn't know where I'd got to in the sheet music in the heat of the moment, and had to go back to the start of the section I was in. Nobody mentioned it and indeed my teacher's husband, who is an ex concert Pianist (and a much better Pianist than my Teacher) came up to me and congratulated me. To some extent I'm sure he was being polite! I've since had a lesson with him (earlier this year), now that made my hands sweat! But I needn't have worried he's a lovely man.
Just go along and do your best. Good luck
Simon
All round average Jazz, Blues & Rock player.
Currently working towards ABRSM grade 8.