New to socializing, people are rude?

I'm the kind of guy who minds his own business and when people came to me I would be very friendly. That was who I was in high school.

Now, in university people don't know me, so they don't say hi. So I try to start saying hello to people in my class, making friends, but for the most part it seems they aren't interested in a friendship which is weird to me.

I sometimes feel like I should slip back in to the mode where I let others approach me, then I can be friendly to those who do.

How do you guys handle social failure like that? Where you try to make friends with somebody who doesn't respond friendly?
New to socializing, people are rude?
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