I have quite a visibly thinner base than the rest of my penis. It is also quite weak and I lose my erections quite quickly..I almost feel like I have to forcibly force blood into it to maintain it. I'm really most concerned about the thin base..because I think it may be irreparable. I am 21 years old, and I smoke and drink, and I've had some bad habits involving drug use which I more or less kicked. Growing up I always wore underwear to sleep and very very rarely removed them at all except when changing until I was about 12 or 13. I really don't think that the base was this much thinner before. I have tried jelqing exercises before and I believe this may have contributed to increasing the difference? I used to masturbate quite frequently, multiple times a day. I pretty much have very rare morning wood and if I do it is not full. I'm really, really scared about the base thing though, and the curve to the left is quite noticeable. Is there irreversible damage?