Always finding something to dislike

So I’m being really hard on myself and don’t know whether I just see someone about it because I do think it’s strange I always do this and toxic. But with my friends I always seem to “find their true colours” that’s the best way I can describe it. For example, one friend said she’s a people pleaser and she acts super sweet with people and this and that but I have realised she puts on an act and can be quite sly and manipulative and when I’m around I feel as though she puts me down and says comments that make me feel crappy but I don’t know if I’m just overly sensitive. Another friend is super ditzy and it’s sooo frustrating and everything she does can be irritating because of it. My issue is because I have noticed these things with these people and other friends it’s almost like I can’t get over it. I don’t know if I’m alone in feeling this way