I do not think people would not like me, I do not try to avoid people disliking me, that's not the point at all. Quite the opposite, I'm sure I'm an interesting person and I'm confident people would like me if I could take the step.
Problem is, there is something that physically prevents me from saying "Hi!" to a stranger. I literally cannot get myself to take a step towards them and I can't explain why that is, because I do not understand it myself.
Also quite interestingly (to me), this completely goes away under certain circumstances: (1) If I take around 2-3 units of alcohol and it is not a totally alien environment (it would not help if I was in a bar alone with complete strangers). (2) If more than about 70% of people in the room are people I know well. Then I do not feel anxious about approaching the remaining 30%.