How can i improver confidence in my football game?

I'm 13, 5.2 (so im short) and i am smaller than everyone else in my team due to the fact i play under 15's instead of under 14's. Iv'e got a good eye for pass, good stamina and outstanding at passing. I'm very skilful out of competitive football but when i get into the game i panic most of the time. I want to move up a level again since being in the blakcburn rovers academy and the funding went so bye bye me