Confidence

Hey there ladies! I’m having sex with this guy I really like for the first time. This is the first that won’t actually be platonic for me. I’m really nervous though. He’s also more sexually advanced than me and more confident. I’m not too confident in being on top, but I definitely want to be but my boobs are so small and I have a bit of pudgyness on my stomach. I know it’s dumb. But I want that night to go really well and him leaving satisfied and not like ‘what the hell was that’ or anything. Any tips on how I can perform well and really please him and also confidence?