Sex for first time in 9 months

So because of mental health reasons i gained like 80 lbs in one year and i had anorexia before shit went even more downhill. I've never liked my body but I tried to fake it till I made it. I'm currently 220, but i carry my weight proportionately, so I could look about 190. My tummy is my biggest insecurity because I developed stretch marks there due to rapid weight gain. I'm trying to be healthier. I know what I'm worth and I know that I have so much love to give if someone gave me a chance.

Then someone did. But I haven't met him in person. I know him from freshman year high school but we reconnected and just facetimed and now we're a thing lol. I felt the need to disclaim the fact that i was overweight and i didn't have a perfect body which was really hard for me to do. He told me how me opening up to him made him fall even harder for me and how he will never ask me to change for him and he supports everything I do as long as I'm not in danger.

I feel like it's too good to be true, but we openly talk about sex because we're both high sex drive level lol

I guess my question is how do I feel comfortable during sex when I hate my body? What if he gets second thoughts once he sees me?

I bought cute underwear that flatters me and sexy bras but im scared that won't be enough.