Can't have sex

[Rememberwhen]

I don't think i can have sex, i've not been in very many relationships, but i have been quite intimate with men. i couldn't have sex with both my last 2 boyfrienfriends and recently dated someone i quite liked but when it came to it couldn't have sexual intercourse with him. i'm mostly ok with other stuff but can't seem to well have it really.

I'm worried that there may be something wrong with me should i go and see a doctor? I have only had sexual intercourse once and that was about 5 years ago now.