I Am My Own Worst Enemy

Not sure where this is coming from, but I kept thinking about this all day, how I'm not smart, and how unhappy I am about it. And why? I just wish there was something good or cool about me, but there isn't. I feel very unimportant and unnoticed. I used to be pretty when I was young, but I don't have that anymore either. I have been much better at not thinking these thoughts, and thinking positive ones, but these thoughts were just attacking me today, like they were coming from outside myself.