Oh my, we have so much in common! Thats just it, these are thoughts only perceived by us, but they are so real. It's like you said, it just nags at you and you cant get it out of your head. And the worst part, because we are so conscious of it, we are constantly trying to "fix" it, thus making it worse. We try and alter how we act, how we laugh, how we deal, and I think it can become obvious to others.
Just someone not calling me back or saying thank you to me can send me on a downward spiral. This even goes for famiily members. If i write an email to my aunt, lets say, and she doesnt respond, i automatically think that she doesnt love me anymore and finds me annoying.
Yet, i know this isnt real at all! And when i say it out loud, it sounds ridiculous.

Thank YOU for understanding as well!