Sometimes you're depressed or lazy or for whatever reason consistently doing unproductive or annoying things. In this case, good friends might make you feel bad about yourself in the course of helping you improve your life. Not everything can be judged by how it makes you feel.
This is an excellent caveat to the OP's post, which is good general advice. In my mid-20s, I was working 3rd shift, and a lot of hours, while my then and current GF was working a lot of hours on 1st shift. We had lived together for 5+ years by this point, but I was extremely discontent with life (as background, we had a great friendship that turned into an amazing relationship before the stress began to take its toll). Through a combination of always feeling like a zombie, feeling disconnected, lack of communication, just generally feeling terrible about life, and her being the closest to me, I became convinced that my unhappiness stemmed from our relationship, rather than my own immaturity meeting and external factors. Probably important to note that during this time I never lost respect, love, or admiration; I just questioned our compatibility.
Thankfully, I took time to question my conclusions, and I received some good advice from a good friends. I took some big steps forward in understanding my self and my relationship, changed jobs (no more 3rd shift), and the level of communication shot through the roof. Some years later, I wouldn't say we have a perfect relationship, but it's more perfect than I thought possible. There are still outside stresses, but we're steadying forces in each other's lives.
Definitely don't stick around people who make you feel terrible - or any kind of net negative, but many times when we're making these calculations, we're not in our most centered states, so be careful to make sure that the friend in question is the source of displeasure, rather than yourself/external factors.
