Help Doc....errm Am Not Sure If Am Still A Virgin.

Help doc....errm am not sure if am still a virgin. I get tensed up,scared and terrified anytime I think of sex and also when my bf tries penetrating it hurts soooo bad. Can't tell if he really gets in... but I push him off anytime I feel the pain. And afterwards my tights hurt badly for some days.. when I get home. I never had blood stains and I don't do those exercises that involve stretching the legs and all. Ooh not forgetting.. I kinda feel weird and kinda pain in my knee anytime I think or imagine having good sex some day.