First time! With an older guy

Ash • p chill
So I'm casually talking to this guy. He's a friend of a friend and I've never met him face to face before. We're going on a date in a few days. He's 2 years older than me. We both really want to have sex if we wind up going steady. BUT, I'm a virgin and I'm absolutely terrified. I'm plus size and I have horrible self esteem. I'm so nervous. Any advice?