Why do people stare at me whenever I go somewhere with my dad?

Hello. Im an 18 year old girl, and I've noticed that people stare at me whenever i go somewhere with my dad. i dont have my own car so he drives me whenever i have to go somewhere, school, the store, etc.

I thought people stared at me, but i noticed that people never stare at me when i go somewhere alone, with my mom, or friends.

So, can anyone explain why?
Do they think im dating him or smth? dont they understand that he's my father or what.
Why do people stare at me whenever I go somewhere with my dad?
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