Sorry I just found this thread. I usually don't go outside of my main forum (bipolar), so forgive me for taking so long to respond.

First of all, when I see a bigger person riding a cart, or really anyone riding a cart, I usually have no thoughts about them one way or the other. If anything I may wonder how they got hurt, but in a sympathetic way. I can honestly say I've never just looked at someone in a cart and thought "Wow, what a lazy fat ***!" and I hope I'm not the exception to the rule. People say a lot of derogatory things about walmart and I can understand, but most of the bad things about walmart are about walmart's practices and not the people that go there. If I didn't have a walmart in my town (I live in rural MS) most everyone would have no place to shop.

You also mentioned some other things that make me think that perhaps you have some problems with anxiety. I am extremely self-conscious, really its to the point that I have agoraphobia and I can hardly make myself go in public. Truthfully, I really don't even look at myself in a mirror. I am exactly like you, I feel like when I walk into a place that all of the sudden everyone's attention is on me and they are certainly thinking about how ugly, gross, fat, disgusting I must be.

Do you have a therapist? I think that if you could find a way to see one, you would feel a lot better, or at least work to feel a lot better.