It's all about what goes on in your mind. I love learning about how the mind works, I've almost become obsessed with it. It's so interesting, and confusing yet it all makes sense at the same time. I'm reading a book called Mindset by Carol Dweck. It's a great read. She talks about having either a fixed, or a growth type mindset. I find I have a little of both.
If you want an interesting read that may give you some insight into yourself, I definitely recommend it!