First of all it needs to be confirmed whether the growth is from vagina or urethra. If it is from urethra then it can be HPV warts, benign growths of urethra like urethral polyps or a urethral caruncle. Urethral caruncles are polypoid (or stalk-like) masses, hanging from one area of the urethral opening.
You need to get it examined from a gynecologist to confirm the diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.