I hate Eating in Public.

Okay I know people often feel ashamed when they eat unhealthy foods, but what if you just feel absolutely disgusting EVERYTIME you eat. I don't understand why it has to be this way, but whenever I feel full (not stuffed and overflowing with food), but just satisfied, I feel gross. I do not like how I feel after I eat (especially when I am in public and I have to be around people). I literally feel filthy. I try to avoid eating when I am out just because of the feeling it gives me. I am not trying to deprive myself of food, but I can not stand what it makes me feel like. If I eat while I'm out whether it is at school, work, hanging out at the mall, etc. I feel sluggish (which I assume is natural because you just ate, right)? I feel like a whale (I feel like my neck and stomach have somehow significantly gotten larger after eating), and I feel overall just dirty. I feel I need to go brush my teeth, wash my hands and face, or even shower and drink tons of water afterwards. After all of that I still feel extremely unpleasant until I stop feeling full. It is very distracting when I am in school because it honestly consumes my thoughts until I am able to resolve it. And I don't have very much time to do all of that when I am out and about so I end up just feeling gross for however long it takes to die down. I prefer to feel like I have nothing in me because I feel lighter and more in control of my body I guess? At the same time though I hate it because it hurts being hungry sometimes and I get headaches and cranky. I have figured out ways to have at least a small amount of food in me with out feeling as gross, but I want to know if someone has an idea of how I can fix this. It is all food that makes me feel this way. Sorry this was so long, I was just trying to get my point across.

Oh also I am a overweight for my height and I am already self concious of my body so I know that is probably part of the reason

I'm 5 foot and 155..