Critical thinking, the ability to hold a dichotomy in your mind, gathering facts and drawing your own conclusion. These all fall under the umbrella of intelligence. If you're lacking it, you might miss out on a lot of what life has to offer.

If you're lacking it may just be a matter of your perception. Many people that are viewed or view themselves as unintelligent aren't necessarily wired differently to anyone else, they just don't believe in themselves.

If you change your belief structures and therefore change the way you behave, you can begin to embody the level of intelligence that will allow you to do all the things that you want in life.