Strange lumps around the female genitalia?

Patient: I’m sixteen, and I’ve had lumps forming between the crease of my thigh and female genitalia since I was about fourteen. They’re often full of pus and blood, and very painful (though smooth to the touch, not scabbing or anything), and they can sometimes swell up to the size of a grape and not reduce in size for weeks! I’m very concerned, and nervous about approaching my parents or a doctor. I’ve never had intercourse, so I really can’t even begin to figure out what it could be. Please, can anyone help?