Negative feelings about SEX ruins it for you??

Do you have negative feelings around sex that make it hard for you to enjoy it?

Past experience?

Stigma?

Social driven views?

Low self esteem?

What helps you get past it?

Even though my SO is a great guy, and really sweet, my ideas about sex and my role involving tend to make it hard to turn on for him.

I have really low self esteem and don't believe he could actually love me, therefore his motives for sex must be something else. That and other ideas make it hard for me to enjoy it. Even times that I do enjoy it, I'll sometimes feel really trashy and used after the event. We are 3yrs married.