well for your size i'd say a corner or a safety but if you want to go on offense then wide out is your best shot
Cheerleader.
Defensive tackle
Bench Warmer
RunningBack
fullback?
left out or right corner
If your fast: cornerback or wide receiver
Anyone you choose! - Most coaches would have you on the line
Punter or placekicker. No speed required.
In 7th grade you would probably be an offensive or defensive lineman.
cornerback or safety
I would suggest Full Back. Your size is good for blocking for the Running Back, and your ability to catch and throw would be useful in that position (Full Back Is Usually Passed To)