Okay i have this huge problem with myself,it sounds so stupid and something to not fret over but i need advice

you have to get over it. Who cares what other kids laugh about. Ignore them. They are just being immature. Go up there and just have faith in yourself, you'll be fine. You mite notice your voice will sound a little shakey and what not because your nervous, but you're not alone and keep that in mind. In the end you'll feel good. regardless of what people think. You did the work and you should be proud of yourself. It's your grade. Not theirs. Go up there and do your thang!!!