Why do people stare at me when I take public transportation?

I am 18 years old and I have to take public transportation to school everyday because I don't like to drive. I take the bus and I have noticed when I am riding the bus, people outside or in cars stare at me like I am a low life! Why does everyone stare at me when I take the bus?
Why do people stare at me when I take public transportation?
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