I'm not going to roll down my window and talk to the guy in the next car over
Why don't you want to talk to him?
Sometimes I feel like if I talk to people they will think I'm strange
You seem a little unsure of yourself. If people want to talk to you and you stay quiet, people might think that you are being rude. Who knows, you might be able to make a new friend.
I'm just too afraid.
You shouldn't be. Try talking to someone new everyday to get used to conversation.