Hello dear.. First of all remove all myths & misconceptions from your mind about masturbation. In fact, Masturbation is completely normal & doesn t have any bad effect to the body and mind. Regarding the problem of Erectile dysfunction, it is due to decreased blood supply to the penis. And the size of penis is genetically determined...it doesn t increase after certain limit. However medications like Sildenafil citrate (Viagra) increase blood flow to penis & maintains erection. It can also be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. Regarding the problem of premature ejaculation, it s mostly related to anxiety. So...don t worry about all this & stay relaxed Avoid stress...practice meditation..this helps in improving concentration & builds up the confidence level. Avoid smoking & alcohol. You can also do oil massage of the penis...it increases blood flow & maintains the erection. One more thing...avoid consuming any over the counter medication which claim to increase the size of penis or improve performance...it may be harmful. Best thing is to eat a healthy diet, exercise regularly, avoid stress, get good sleep, think positive and stay happy. Wishing you a Healthy Life. Take care.