Why are people obsessed with having psychological conditions?

I know so many people who are always saying how their doctor tell them they have this, or they were diagnosed with that..and I don't understand why. For example, I don't like people. It's not because I have some kind of deeply rooted social anxiety, it's because everyone I know is either incredibly selfish or just plain stupid. As a kid, I hated school and I never did it. It wasn't because I had a learning disability, or had ADD, it was because I found the school system to be tedious and pointless. So my question is this, why are people so quick to say they have all kinds of conditions? Is it because they feel the need to stick a label on themselves because god forbid they might be a little bit different? Or is it just some kind of odd way of using it as an excuse to hide insecurities?