I'm an introvert too (I actually started a li'l group for the schizoids, hermits and introverts about 30 minutes ago) and I actually find that taking up the initiative can really give you a huge boost. I have the strange ability to decide when to go hyper, so when I meet new people, all I need is the actual energy to be in my system for me to go all out in only a few minutes.
I found out that it helps a few weeks after I was at a gig (for some ungodly reason I managed to be best friends with one of the best singers in Leicestershire - with that and the fact that my brother and dad knew how to play guitar, I was a little bit pressured into music and learned to play the drums after finding that guitar, to say the least, wasn't really my thing). It happened that a girl I talked to while I was there had fallen for me. I helped her out with some family problems and saved her from her dad's anger at one point, and she felt so grateful that a few days later, she finally decided she needed to pluck up the courage to confess.So, due to the fact that I had a high energy drink that night, I got a 2 month relationship. The fact that when I go hyperactive I ignore the fact that some things might be a bad idea, I managed to talk to people and dance for an impressive amount of time with quite a bit of gusto. I find that by accidentally being the life of the party, you can end up in a relationship.