Short, fat penis

I got a serious problem which is worrying me very much.
At age 11-13 I used to masturbate a lot without lubricant and then at 13, I got something like a muscle trauma, and my penis got squashed up. I'm 17 now, my penis is not squashed up some of the time, but it is most of the time. I think I havnt grown in length since then, it hurts sometimes, and I have no felxibilty during erection. Please help!