Maybe it's a case where we attract certain types of people or are trained to see specific qualities in others. I usually never give the vague perspective of "try to be more positive" .. but perhaps it might work here.

I remember feeling in a rut for years, and having a feeling like I would attract really off, fake friendships and couldn't build anything meaningful with anyone. But I had to move and in my new location fostered some good friendships. Maybe a change of location or environment will also work. Cheers!