Will bad sex affect a budding relationship?

I ‘ve been seeing a guy recently, we are not an official couple yet, but we are currently dating and I’m expecting he’d soon asks me to be his girlfriend ( it’s also okay if he doesn’t ask me eventually , this is just a dating phase and I’m aware we might not end up together).

However, he is also way out of my league.
I know he gets advances from women a lot on his level.

Me on the other hand, is a bit fat, I have saggy tits cause they are quite big so not perky in any way plus I’ve been losing weight too, I have stretch marks and hyperpigmentation in intimate areas and I’m not the best looking plus I also have mild PCOS so I’m very hairy in places I’m embarrassed about. I look absolutely nothing like the women he has been with or his friends. Like I know he could have gotten better companionship else where.

This makes me very conscious generally when we are together and most especially during sex, we’ve only had very few times and they weren’t very good cause I’m always in my head thinking so much and feeling body conscious cause why would he want this and this ends up making the experience not nice, I never tell him how how I feel about all this, I always chalk it up to something else.

This is even worse because he always wants the lights on and I can’t even concentrate , I’m always thinking if he is looking at all the bad things about my body and how prettier and sexy the women he has been with are.

I also know that sex with his ex’s and past flings were amazing.
He didn’t tell me that but sometime ago before all this, we had a discussion about sex and from something’s he said I could tell he’s had a good sex life with the people he had been with.

I’m only really worried about this because everything else with us is good, we don’t exactly have any other significantly huge issues between, at least that can’t be settled.
I just know how unenjoyable sex with me must be for him and I feel like at some point he might get frustrated with it all and want to leave or not make things official anymore.

I’ve heard and read stories about how bad sex messes up a relationship .
I know that a good intimate connection and sex is also a plus for a relationship and my insecurities are just going to kill this.
This happened again last night when I got in my head again during sex and he won’t turn off the lights, and I could tell it didn’t seem enjoyable for cause I was stopping every time, though he said it was okay and we discussed have to continue.

This resulted in a mini argument cause I started initiating sex again because in my head I was thinking I like I’m going to make sure this one is good and we’d both enjoy it but he didn’t want to anymore and said I was pressuring him and that it’s not all about sex.

I’ve not had these problems in my past relationships before but with him I’m so body conscious and anxious that it kills me cause I like him a lot and we have such a good connection but I feel like it may not bud into what I want it to.
Do I tell him about my anxiety and how I feel about my body, he also doesn’t know I have PCOS.
Maybe I could explain my anxiety and ask him to be patient with me.
Would this make me more relaxed if he knew?, I just don’t want him to use my weakness against me.

I don’t know what to do about this situation.