What should i play in fresh man football?

im 5'10" 145 with a strong core chest legs and arms my 40 yard time is 5.4 seconds and my a hundred is 13.8 i can cut real fast can only catch the short p. very strong for my weight never played football with pads on. i have a very good knowledge of the game. i want to play running back tightend linebacker or full back wich one should i play. or if you have other suggetions say them to. i still have 7th months to grow.