What position should I play in football?

I'm planning on trying out for football this school year, so I just wanted to know what I should start practicing on. I'm going into 8th grade, I'm about 120 pounds, and I can bench about 100 pounds. I have large, husky bones and I'm very short for my age (I'm the shortest guy in my cl.) I also have a pretty good arm and good hand-eye coordination. My main thing is that I can't do long distance very well, but I'm a pretty fast sprinter.