⚠️NEED HELP ASAP⚠️

So I've been feeling very off. I don't think I'm pregnant or anything, but my vagina is starting to hurt really bad. The thing is, I'm 18 and I don't want to tell my parents that I've had sex but I'm sure I'm going to need to say something soon. I just don't know how to bring it up. Can you help me please?