Pain during sex

Tee
Okay so I've recently experienced pain during sex, or maybe I'm just now noticing it.... Well anyways the area around my vaginal opening is very sensitive when I clean myself and has been for a few weeks now.... Occasionally I'll have a pulsing type feeling down in that area but I just tried to ignore it. I was told that I had a cyst on my left ovary in December of last year and was given birth control to help manage it. I'm really freaking out because I think I may have endometriosis after doing some reading. I'm only 21 :/ help