Why do strangers know my name?

Illusive_Man
So I've been in college for a week , joined a few orientations , made some friends know a few names , but since then I've noticed I'm catching quite a few random looks from people and people whom I have NOOO idea who she / he is knowing my name coming by and saying "Hiiiiiiii"

I'm not sure what I did or what I said but this is starting to get uncomfortable REALLY REALLY fast to the point which I'm getting some random guy inviting me to his dorm to smoke some greenies and get high.

Now I LIKE to make new friends but people knowing me before I know them is border-lining on creepy...

What would you do , cos I'm feeling a bit paranoid right now.
Why do strangers know my name?
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