When i was 11 years old when i started masturbating a lot like every week. The loss of feeling is been going on for two years. The last two years it very bad and I started having trouble having erections. I went to a urologist, they tested me in a hospital/ blood test, injecting dye and measuring how long erection lasts, etc..., but physically there are no problems according to them. Also my nerve system is normal and i have visited the neurological. any suggestion?