I think I have with a problem with maintaning an erection and numbness. I have been masturbating since I was 14 years old. I am about to be 28 in less than too weeks. I have been masturbating a lot since I started at 14 sometimes 2 to 3 times a day but not always. I am wondering, have I just become accustomed to using my hand to get off and is that why I have trouble during sex, hand jobs or oral or what? Do I need to lay off the masturbation or is it mental? Thanks