If you're self conscious about anything about yourself then it's natural to assume that other people are focussing on that too but the reality, more often or not, is that most people couldn't give a toss. Personally, if someone is rude to me I don't think it's something to do wit me, I think it has everything to do with them. Whenever someone stares, ususally children because they are less subtle, I stare straight back and the reaction to my silently calling them out, is always embarrassment on their part.
Recently I enrolled at a gym and during the intake I was asked what I wanted to focus on and I said my post pregnancy jelly belly, to which he asked how old and I said ten and he went off on a ten months post delivery is nothing rant and he'd wish women weren't so bloody hard on themselves. To which I countered ten years not ten moths, he looked embarrassed and apologised. I let out a huge laugh and said he was absolutely right but I definitely wasn't in the too hard on themselves category.
I pretty much look the same (normal weight as opposed to just under) but my couldn't give a rats arse what people think of me, has definitely stopped the almost crippling paranoia. Do not underestimate what self confidence or lack theirof, has on other people. Confidence is more of an attractive trait on a person.
If I could go back in time and talk to my younger self, I would definitely tell myself to chill and not let my insecurities be my focus because they most probably not anyone else's.
I'm not disputing that some people behave badly to other people but they are in the minority.