I am 21 year old. I have habit of masturbation since my early age. When I was 12 or 13 year old. But my masturbation process is different. I use to place my penis and testis too between my two thigh and shake my legs which continues to press and relax my penis and testis too. I used to do some time when even my penis is not erected. I use to do this 3-4 time in a day. So now my problem is that. I fell that I do not get my full erection even after watching porn. I got my precum. But not fast fall. But no full erection. And even after half erection. I loose my erection very fast or easily. What should I do now.