I can't have sex

So this might be a lil awkward but I feel like I can talk about it here since no one knows me on here.. So am a 21 year old virgin, I decided I wanted to loose my virginity wen I turned 20.. But that night I couldn't go thru with it because it hurt so bad, now am not talkin about normal pain.. I mean like crucial pain.. Like it was horribly painful even his pinky couldn't even go in. I can't get fingered because nothing seems to go thru without it hurting so bad. I get regular period flow. Am just tired of trying cos anytime I try I can't seem to go thru cos it hurts like a demon lol. What do you think I should do???