I hate myself because I'm stupid?

Some people are simply more adept at learning then others. this is just showing you what your limits are and that some people have to work harder to achieve the same things as others. There's pretty much no way for you to become a fast thinker. Work hard and learn what you can do and what you can't do. there's nothing wrong with being a little slower then others, you'll just have to work twice as hard.