Self-esteem issues before or during sex?

Did any of you suffer from self-esteem issues before your first time during sex or during it? I'm a virgin and I'm in a pretty serious relationship and he's made sexual advances towards me multiple times (we were interrupted each time 😂), and I'm extremely nervous about what he'll think of my body.  I've always been self-conscious and I hate it. How did you overcome your self-consciousness?