Hi, I'm currently new here because I'm really worried about my health...

I have seen a similar post, but I'm not sure if it is the same.
I too have a small lump under the skin of the groin, but it is to the right side base of...how should I describe it...between the inner thighs...or simply where a woman's vagina should be at (When viewing downwards).

I have noticed it before. I had it once before and it disappeared by a few weeks. However, I noticed that recently there is a new lump. The lump is quite solid and unable to push inward. Through physical activities I generally don't feel it, but it's quite noticeable. If I do apply pressure, there is no pain.

I have been masturbating and fall to sleep while the sperm is on the underwear for quite sometime.
(...I know, it's sick, I'm trying to stop the habit)

Can anyone give me advice on what this may be? I'm sure that I will be going to the doctors to check it out, but right now I'm just too embarrassed to tell even to my brother.

Thanks for listening~

P.S. I'm 15, turning 16 this year. In addition, is there a method to stop...um...my "habit"?