I am a 17 year old male and have had this issue for quite some time now. Yes, I do frequently masturbate. I have a vein that is on the top of my penis that is enlarged. It goes straight towards my tip but then about halfway from the tip of penis it curls. It has been enlarged for a while. I am really worried and this is my first time asking for help. I do not have the money to see a real doctor right now and really need the help.