Dagny18 I can very much relate to where you are.
I think I have learned what many here have said, which is focus on the internal, not external.
For example for you, I have a feeling a lot of what is actually happening for you is you are just not that experienced at dating. (By the way, I think most people are not that great at "dating" regardless of the reason, because it's a weird thing, and even at my age many of the men were married to one person and are now finding themselves dating again in this weird new online world).
I had a friend who suggested to me "don't talk about body issues at all" and that was really freeing.
What I did let myself talk about (not necessarily on the first date, but when I started to get to know someone), was my nervousness about not feeling like I was well versed at dating or intimacy. Everyone I dated, regardless of their background or age or how they looked, said they felt similarly - that everyone still just feels a little nervous or "not good at this".
Dating is hard. And also fun sometimes, not fun sometimes, but overall a really interesting rollercoaster. And it is completely, totally fine to make a lot of mistakes.
When you find people who are the right matches for you, they won't care. Like Ian said above, everybody has their things they feel aren't "perfect" and part of a good relationship is acceptance of the "whole" even while you are working on it.
For me, I also did what NYFLAgirl suggested, was to just go on as many dates as possible, and really see the range of partners that are out there, and the range of body issues they have.
And I would recommend having a rule for yourself that if the partner has issues about your body on the first date or you feel them not attracted to you, do not go on a 2nd date. Relationships are challenging in general, let yourself at least start with someone who is naturally attracted to you. That was hard one for me to finally get. You deserve and have the "right" to a partner that is attracted to you AND that you are attracted to. And don't worry if you need to go on 75 dates to find the "fit".
If you are doing online dating or considering it, I also highly recommend reading "Modern Romance" by Aziz Ansari if you haven't yet. That book really helped ground me about dating (and it's also very funny

).