It depends, are you fast? can you throw, kick, a lot of intangibles go in so you can't decide anything on body type alone...
Benchwarmer.
cornerback or safety
The circumferance of an official adult size football (soccer) should be not less than 27 inches, not more than 28 inches.
high school?.. sounds like you should try tight end.
anything but defensive linemen
Waterboy.
12 inches
Cheerleader.
running back
Either lineman or fullback
Q.B, running back, Wide Reciver
Bench Warmer