The fact that you want to be smart in front of everyone is enough to make you unsmart. What people said, what they thought, you can't be smart as long as you pay attention to them.
There are some boys who think it is smart to wear an expensive shirt with jeans and a gel on the head and ride an expensive bike behind your girlfriend.
Again, some girls think it is smart to mix flour like ghosts.
The definition of being smart varies from person to person.
Want to be truly smart?
Take charge of your family. Take care of them. Try to benefit people as much as possible. Refrain from doing harm if you cannot do good. Learn not to overdo it. Reduce dependence on people. Lower expectations from people. Avoid wasting time on someone who doesn't like or evaluate you. Remember, even if you die, it doesn't matter. Don't say drugs. Avoid lying, lies are the source of all guilt. Talk less, talk less and don't have enemies. Try to live in the present without thinking about the past and the future. Learn from the mistakes that happen in human life. Because your life is not so big that you will make mistakes one by one and learn.