Masturbation Effects?

Hi, i am 15 years old and had some questions about masturbation and certain "side effects" of it. I masturbate about 2 to 3 times weekly and notice that normally after i do it i feel weak and my legs feel rubbery, i also notice that it was causing some minor brusing when i was doing it twice a day. I have limited myself to weekly and i am trying to quit it completely, any techniques to quit? My other question was about the whole masturbation/acne scene. i appreciate all answers