Penis size is not related to masturbation.

Your penis length is average, so you have no reason to change that.

As far as the girth, I don't know of many safe, effective, and natural ways to change that. I usually recommend that people stick with their natural shape and size unless it is so extreme that it causes pain or makes sex difficult.

Penis size is almost never as much of an issue to women as it is to men. A lot of men don't realize that not all women want a big, long, thick penis. Some women like them big, some women like them medium, some really don't care either way, and some women like them small. Personally, I don't care much either way. There are good things about a big penis, and there are good things about a small penis.

Ive got ideas to get you a nice, thick dick... Let me know if you are still interested.

please advise as to how i can become thick?

during 75% erection(not full, that will cause injury), make a loop with your thumb and index finger, tighten it around the base of your dick as much as possible(dont hurt yourself). then as compress your dick head with your other hand and hold for like 10 minutes. do this several times a day everyday( you can take an occasional day off). Also look into kegels and milking techniques.