Smart is not something that you are or are not, it is something that you can become. Nobody is born smart. You may be able to pick up on certain concepts more quickly, be able to do complex math in your head, or have a great memory, but most of the time, just like anything else in life worth having, you have to work to improve on your God-given abilities.
Do not think of yourself or others as smart or dumb. And especially do not think that whatever they are now is what they will always be. People are learning everyday through experience, whether they intentionally do it or not. In addition to learning by doing, you can accelerate your learning by reading, listening, and talking with others who have already taken the path that you’re interested in pursuing.
What are you doing, reading, or listening to today to help you grow into the person who you want to become?