BBW on top tips

Okay so I'm a BBW aka big beautiful woman. And I'm dating a very sexy guy that I love to death. We have great sex but I can't get the confidence to get on top. 😢 I get so self conscious and all sweaty and not because I'm big but because of nerves then me being sweaty make me even more nervous and more sweaty and it's an awful cycle. So I avoid it then I feel bad 🙄😒😕. Any tips or ideas from other big girls?