I might not care enough

One characteristic that I like about myself, is that if someone tells me something mean or negative, most of the time I really do not care. They can call me stupid, ugly, a loser, or any combination of the 3, but I would not give it a second thought. Even then, the things that do get under my skin are often dumb, like doing better than me on a test and other stuff that does not matter that much. Weirdly enough, my not caring attitude is one of the things I dislike the most about myself. A lot of the time I cannot find motivation to do homework or a project. Sometimes people try to tell me important ideas but I sometimes ignore them and continue on. I am so split on how I feel about myself, that I guess I am not quite sure if this attitude is for the best.