First off, popularity is nothing but a cruel, sick joke. Be yourself. So what if you don't fit in? I've had bad experiences with "popular" people, and trust me, a lot of them... aren't good people to make your "role models" or whatever.
As for talking to people, just be confident!
Couldn't have said it better.
It doesn't matter if the glass is half empty or half full.
Be grateful that you have a glass with anything in it.