Do you consider yourself as a smart person? It was an absurd question actually. Everybody thinks that they are smart, and actually, everybody is smart in different ways. However, how do you measure that? Do you compare yourself with other people? If you answer yes to any of these questions, then we have a good news for you. You can know which side of your brain do you use or not.
On the other hand, as we said earlier, everybody is smart. However, the way they use their brain might be different. For example, some people may be very successful with the math and other may be successful with other subjects. As Einstein says you cannot judge a fish with the ability to climb a tree.