weird vagina pain

So idk if any girl has experienced this or not but when sometimes when I get with my boyfriend I get a pain in my vagina. Like I won't be into the idea of doing anything then he will turn me on and I really want it but then I get this pain in my vagina like in my walls like a soreness or almost a raw feeling. It never lasts once he starts messing with me and fingering me and stuff it goes away instantly but until he touches my vagina it's very uncomfortable and I can't enjoy the fourplay cuz it's too noticeable. Sex is fine more than fine actually lol and after is fine it's just before. I'm almost positive I don't have anything because I had my yearly check up like a month ago so idk what it could be