Body will get strong with taking of protein food and exercising.
Do lots of cardio and strength exercises coupled with proteins as in meat, milk, eggs, soya etc. Have food rich in minerals and vitamins with sufficient water.
With following this for atleast 6 months you will see a change.
It is normal for every human being to be special and you are also!
Masturbation has no ill effects but not good because it is habit forming and will become regular, good you have got over it.