Whenever I get horny and turned on, before anyone even touches me, I get these deep aching pains in my vagina. Is this normal? Because it didn’t always used to happen until somewhat recently

No, that is not normal and usually indicative of a problem going on. I would make an appointment with your gynecologist and have it checked out. It could be nothing or it could be a symptom of something real happening (ie. ovarian cysts, inflammatory pelvic disease, something with your uterus, etc.) Get it checked out. Better to know than to be in pain and speculating.