Your body is no where near being developed enough to be very strong. I wouldnt take hitting the gym serious until your atleast 16. Oh yeah and your not old enough to be on this site so get lost.
You are a weak little pussy. Besides why bother working out? You will always be a weak little puss and you won't get laid no matter what you try to do. Give up now and go suck some cock in the locker room.
Have a good one.