Transition 2 high school bball? ?

what is the biggest transition from mid school to high school bball. im only a freshman this year but im not playing freshman ball but im playing jayvee (10th 11th grade). im 5'6 118 (i didnt get my growth spurt yet. im goin 2 b smaller than alot of the kids i am going 2 be playing this year. im not extremely quick but i mite b 2 small 2 play forward this year. im a good ball handler nd i have alrdy developed an automatic jumper from mid range nd i can knock down the 3 when im open. the best aspect of my game is my D nd i can play a lot bigger than my size. im not afraid 2 go hard 2 da basket. does anyone have any tips 4 me this year having an easier adjustment this year. Thanks