But people can make you think the thoughts and feel the feelings that you wouldn't have otherwise.
And those new things can improve your understanding of yourself.
I recently understood that I need to avoid people with fragile ego, that get hurt when their opinion is challenged or proven wrong and people that assign to other people the responsibility not only for their speech and actions, but also for the emotions those things invoked in them.
I also need to build up my emotional resistance to being misjudged and cut off without chance of defending myself, because it turned out I'm quite sensitive to that.