I don’t believe anyone is universally good or bad in bed. It depends on so many things. Chemistry, confidence, how you’re feeling about yourself and the other person
Men find enthusiasm universally sexy
These two pp speak the truth OP! And also, the ones who are encouraging you to not give up finding the right man in bed for you. It is a partnership, good sex. And being able to communicate about sex is vital if it's ever going to be good for you both.
And men really, really don't see the lumps and bumps we beat ourselves up for having (especially when we're mums with tell-tale 'mum tums'!). A good man will want to please you, so if you know what works for you, tell him. If he's a decent lover he will do his best to please you in that way. And gradually you work together to find what works for you both in lots of different sexual ways.
I've had bad sex (haven't most of us? apart from a lucky few!) but the good sex I get now is like night and day. And I wasn't experienced - I'd never even experienced a man going down on me until I was nearly 40 (then-DP didn't do it (thought it was 'disgusting' to get close to a woman 'down there' but I was sure it was what I needed to orgasm, as PIV does nothing for me in that respect). But what an eye-opener (in more than one way!) that first time current DP told me my bodily aroma and taste was amazing, and that he 'loves it down there - could stay down there all day!' (and he probably means it!).
That's just one example of what a non-crap-in-bed man will do for you to make you feel good. There will be countless other things with the right man. Don't give up, OP. You're still young (yes you are!) and you'll know when you hit the jackpot, that it was never you in the past, but very much 'them' who were crap.