Come to think of it, you're probably someone who is resistant to fashion and to trends. You don't like to be a part of the crowd of people who give up their comfort and individuality to belong.
You don't like small talk because you find it boring. You don't enjoy talking too much because you are an introvert. People may find this kind of behavior weird.
Another reason could be your interests that others don't understand. Perhaps you're very keen on robotics, ancient weapons, or magic. These pursuits of yours that are not mainstream make you an outsider.
Some people see others as weird if they are shy. Shyness makes people do awkward things when interacting with other people. It also causes them to avoid social situations.