I'm 16 years old,and I have been masturbed for 3 years,just 4-5 times a week.Sometimes I did not clean very clearly,and for many times I had got some white thing just small about pip drop appeared in about medium of my penis,sometimes it dry but sometime like water,and it not hurt.But this time,it got hurt,and it turn to yellow,and it looks very terrible,like u got some diase.I'm very afraid of it,that I got some diase,and it can be affected to my sexual life later.But I also think because I do not clean clearly and that made it,but how can to stop it?Can anyone help me?Thanks.