Tips to get over this anxiety!

Okay so I’m about to be 20, and have had sex with only 4 guys total (one guy twice) since the time I was 16. I enjoy sex, and want it just as much as anyone would, however I get SO nervous. Like to the point to where half the time I bail out because I get so nervous about it. My body isn’t that bad but I’m still super self conscious about myself. Maybe I’m nervous about how I’ll “perform” or that I’m bad at it. I have no clue but I really am trying to get over it. I feel awful cause here’s this one guy who always asks me to hang out (and coming from him that means he’s tryna dick someone down 😂) but he’s REALLY attractive and we’ve had sex before, but I always come up with excuses and I just don’t wanna be that person anymore, but I can’t help it. How do I get over it?! Tips please?!