Kids who try for the great catch in the outfield often turn singles into triples. Don't worry about your performance. Try to stay relaxed. If you wind up on Team B instead of Team A, it's probably for the best. It's better to play on a lower level team if it means you'll play more and have more success.
Coaches usually end up putting kids where they'll do best.
Let them see your skills and let the rest take care of itself. Whatever team you wind up playing for, give it your best shot, and you'll have a successful season. Remember, there's not too many things out there better than playing baseball, so make sure you have fun.