I'm afraid of sex..?

Elly
My current boyfriend and I haven't had sex yet... I'm not a virgin. I went through a traumatic experience with the guy I lost my virginity to.. he was very abusive and he would force me to have sex with him. Since breaking things off with that guy a year ago, I stopped having sex. I had a one night stand with a friend of mine last summer and I freaked. I want to be intimate with my boyfriend but I have this feeling that sex is bad and just thinking about having sex makes me feel really insecure about my body.. and sometimes after we been really close to having sex, the next day I'll feel pain down there as if we did have sex I know it's probably all just in my head but I don't know how to get over it.