FWB and Body Image Issues

I'm about to have my first FWB come over tonight and I'm really nervous. We've been texting for about a week now and I'm really self conscious about my body. We met on a dating app so he knows what I look like but not what I look like naked. I mean, I'm not looking for anything deep or meaningful and he's on the same page but still. I'm overweight, have stretch marks on my belly and hips, and I look at my arms and see the Michelin man. I know being self conscious about your body isn't anything new. I'd really appreciate any stories or advice about this topic. Thank you all!