Most people don't even who they themselves are so for anyone to judge you if you are honestly trying your best, isn't a good person. Instead of negative thoughts think positive ones. I know that seems almost impossible but every time you catch yourself thinking something negative force yourself to think of the opposite scenario, in time you will train your mind to think positively. That's I did. When I was younger I walked into the room thinking everyone was going to judge me and not like me so Iy stayed to myself (and stayed miserable). Now I walk into a room knowing I won't be everyone's favourite person but also knowing I'm a pretty cool person to get to know and be frriends with.
It's all on how to train yourself to respond to situations. It might take a bit but you basically have to unlearn a habit you've been doing for most of your life.