Thank you for your question. Masturbation is quite normal. It has nothing to do with how strong or weak you are. As long as you masturbate with a relaxed mind to enjoy the process you will be fine. The frequency varies from person to person. Generally 2to3 times a week is good enough to keep your sexual health functioning well. If you practice daily make sure it is not a substitute for dealing with things going on in your life or as s stress buster. It is better to get professional help from a counselor or psychologist than to use masturbation to distract you from dealing with life issues. Regarding your health please find a fitness instructor who can guide you on a proper nutrition and exercise regime so you can get fitter and stronger.