Cant eat with other people, iin?

I cant eat with other people. Ive gotten better at it with the years but its still a horrifying experience. I cant have anyone look at me while I eat and I find it pretty gross to see other people eating unless they eat very neatly and make no mess what so ever or any noise or talk to me or each other so drops of salvia fly around and contaminate my food or drink.
Its even harder to eat at other peoples houses. I would need to observe as they cook in that case so I know every single ingredient they cook with. I fear something being in what I eat or drink that I cant tolerate or that they arent hygenic enough when they cook or prepare their coffee or anything hence what I have to eat might be contaminated and gross. I hate going to anyones house for this reason and feel annoyed and pressured when someone invites me over for food or wants to go out eating. Sometimes for example people have glasses with stains on them and those glasses are according to them "clean". Disgusting. One can only imagine how they cook then, in a filthy kitchen?? Ew. I also hate sharing drinks. I had an ex who always wanted to get a taste of my drink and I wouldnt let him. Its just disgusting with peoples spit. Makes me nearly vomit.