Well it all depends if you got some muscle on you then you should be fine to play football and you can always workout and lift weights if ya need to get in shape for football season. However you don't to much muscle though all depends on what position you take such as a line backer needs to be bigger as a running back doesn't need to be as big just quick.
I don't see why you can't at least give it a try, you would probably want to build some muscle before the season starts, and if you do decide to do it start as soon as possible so you can get practice in and have a chance to start or something.
