Dear Welcome to HCM We understand your concerns I went through your details. Masturbation cannot harm your health. Masturbation is normal, natural and even animals masturbate. Masturbation will not cause any adverse health problems unless you excedd the limit. At your age, you can masturbate thrice or four times a week safely. Excess masturbation causes to spend more energy and thereby you feel tired. Tiredness is stressful and results in anxiety. Lack of knowledge about masturbation and sex also causes anxiety like the one you have now. Do not worry. I reiterate. Masturbation is not unhealthy and cannot cause any erection or penis problems. If you still need my assistance in this regard, please use this link. http://goo.gl/aYW2pR. Please remember to describe the whole problem with full detail. Hope this answers your query. Please feel free to post follow up queries. Available for further clarifications. Good luck. Take care.