that's a tough friend to have! You could try asking other people exactly what it is about him that they find so appealing; but it may be that he is just one of those lucky people loaded with charisma (or money or Brad Pitt looks or something). But most people don't have it that easy; all except the very self-confident ones are probably closer to you than him in termperament.
So, two things you can do. One is get used to it. You're the quiet sort, you don't go out every night, you have other things to do than just socialise. Plenty of people are like this; it's nothing shameful.
If that doesn't appeal (and I'm guessing it doesn't or you wouldn't have asked this Q), then you have to really make an effort. Force yourself to chat to strangers. Don't talk abut yourself, talk about them. Take an interest in their interests. Ask them where they come from, what they're studying, how they like life at uni, what they did in their holidays, what clubs they belong to, anything.
And maybe don't seequite so much of your popular friend if he's making you envious. If you can catch a ride in the slipstream of his popularity, fine; but if it's making you feel worse rather than better, perhaps strike out on your own a bit.