If you are sure this has never been there before you first noticed it, go see your ob-gyn and get a checkup, and specifically ask if it might be genital warts. I would not be scared in your shoes, but I would certainly be eager for a good doctor to give me an exam and tell me what it is. The pain you are feeling in your left ovary might be something totally different, like an ovarian cyst. Good luck! and write back with what the doctor says it is.
I agree that an exam would be a good idea. It is for all women your age to start doing regularly (once a year). clinics can do it too like planned parenthood if you live in the United States). If you are in school like college, they often have a clinic that can do it. As your mom if none of this is ringing a bell to set up a doctor's appointment for you as she probably can recommend her doctor if you've never had a pelvic exam before.
Our vagina's can have things that feel funky in it. We aren't good at always knowing what they are ourselves. Things like your hymen . . . no idea what you mean by you have an annual hymen. By the way, we can break that through fingering. But determining if it is in tact or not ourselves is hard or if we are touching our own cervix, etc. You could have genital warts although you are a virgin. Less likely in that case. Did you have the vaccination for it? My kids did at age 13 and all should have it prior to becoming sexually active. But that would be important to know.
Our vaginas can feel kind of crinkly (mushroom head?) but you should get it checked out. Could it be a prolapse pushing through-- this would be like a bulge. It's kind of an unlikely suggestion though. If you are overweight or smoke, maybe. But I would not worry 'too' much about that possibility.
If you are talking about closer to the entrance of your vagina, this is an area that can feel different. And if your hymen actually broke, it can have remains that feel lumpy.
A vaginal cyst on the wall can happen. Not uncommon. Usually they have NO symptoms and aren't treated. Unless you have pain during sexual activity or can't insert a tampon, a doctor will likely tell you to leave it alone.
That's my guess, vaginal wall cyst. But only a doctor can determine this. See one and let us know!
You said annual type of hymen so asked what it was. ! You sure are in touch with your hymen. We are volunteers that try to help people. Stated it is likely a vaginal cyst. Usually doesn't require treatment. good luck
I might add, some people have a cervix on the right or left, not directly at the end of the vagina. Not everyone is built like the anatomy books. But since you said it is changing in size (growing) that would not be it, unless you were feeling it at different times of the month (women doing natural family planning always put great store on whether the cervix is hanging down or not, it means something about their fertile time of month). I hope the abdominal ultrasound works for you and your doctor does not do anything that penetrates your hymen, since that sounds very important to you to preserve.