I know exactly what you mean, and I know I've changed that about myself, so that it can be done. I've opened up to letting other people show and tell me what they think, instead of living in fear of them or pre-judging them. It was time consuming, it took work. I am glad I did that. I feel a lot better about the world in general than I used to- I don't pretend everyone is a saint or there are not horrible things happening, but I get a lot more out of my interactions with people, I'm less scared and I am more realistic.

It doesn't happen overnight, but there are ways to consciously sort out your perceptions and see if they're really working for you, and then change them if you want to. Hopefully your T can give you some concrete, gradual help on this.