Trying to find out what the lump between my urethra and vulva opening is

Okay so I'm 17 years old and I am not sexual active and I am a virgin. I have an important question about my body, my hymen to be exact. At least I think so. Anyways for years I've always had this lump looking thing between my urethra and the top of my vaginal opening, it's soft, I think it only hurts a little when it's touched with dry skin which is hardly, It's never bothered me but lately I've been wondering if that's even suppose to be there, I urinate fine without pain or burning and I get my period normally too. Now to describe it better, there's my urethra and then connected is the lump thats fairly large, not BIG but if a doctor checked me; its impossible not to see, then it connects inside with my vaginal opening but just the top of it, then I have a normal vaginal opening below it, and I can see what looks like my hymen, looks normal to me there. I've used tampons with no problems and such but I'm thinking if I have sex in the future, it would be painful or impossible to just pass it without rubbing it which would hurt I'm thinking. So about 2 years back I went to the doctors because I was sure I had a yeast infection, they checked me out down there and did a pap smear, I didn't mention the lump because I was there for another reason but the doctor also didn't say anything about it so I had been relieved and thought it must be normal then but when she put the metal thing during the pap smear; I felt it hit the lump and it hurt but then after she pulled out; I felt no pain at all, but then I think about how it would be if I had sex in the future and how it might be a problem, I just can't figure out what it is. I'm thinking of just getting a pelvic exam in general and have my doctor just check that all out to make sure I'm fine but I honestly feel completely alright and just want to know what it is, i'm not looking for a diagnostic here but if someone has idea of what it could be and shine some light on it, I'd be grateful.