1. The really competitive friend
Everyone has that one friend. You put up with her because you try to tell yourself that "she pushes me to do things out of my comfort zone." At the end of the day, you have to realize that her eagerness to show you up is actually a passive aggressive tactic that will wear you down. When she brags about her latest accomplishment that is better than whatever you did, she's belittling you. That is just not the way friendship works. By constantly comparing herself to you, it is damaging to you and her in terms of self-confidence, worth and esteem. No one likes to not ever feel good enough.
[Photo via @marhunt]