what is the name of disorder?

Hello, I sometimes feel this too... I think it is because of the avoidant personality disorder... I think you feel guilty because you consider that the person in front of you is considering you guilty, but actually only you judge yourself harsh, the other person might not even know you at all. Try not to think at all about what the other person might think... just focus on the conversation and if you still feel guilty tell yourself that even if you made some mistakes in your life, it's ok too, the person in front of you is not perfect either, no one is judging you (because no one is perfect). Also, if you cannot look people in the eye, look at their forehead, in the middle, they will not notice that you don't look them in the eyes; that's until you relax and will be able to look them in the eyes. For me it also helps writing in a diary and describing how I feel and why I consider I feel like I feel. Good luck!