I'm 17 years old and a virgin. I recently got out of a relationship with my girlfriend who I was with for four months, but we didn't even get to see each other for the last month and all we ever have done is kiss. Two days prior to this I noticed that when ejaculating from masturbation that at first coming out of my penis it was a little brown, then the rest would come out white like normal. Then today it came out dark brown, then went back to the normal white. I'm going to try to go to the doctors in two days, but I was wondering if you might have any idea of what it is.

No real idea but it sounds like you definitely need to see the doctor about this.

Has there been any pain when urinating ?

Fr_Chuck, I haven't felt any pain while urinating. As I was looking around I came across something Hematospermia, and it's the only thing I've found that even sounds close.