I think it's normal for heavily introverted people to think that they've "missed out" somehow on the typical teenage lifestyle - I do, at times. But ask yourselves this: were you even capable of living such a lifestyle? Is it what you desired at the time? If the answer is no, then you may be lusting after something you never really wanted to begin with (obviously this doesn't apply to those who were ill, bullied, or repressed). Back in my teens I simply preferred solitary activities. I didn't want to drink, take drugs, go to parties or have a girlfriend, and I didn't fit in with most people my age - I just wanted to stay home, read, watch TV, play games, and browse the Internet. Is that so bad? I enjoyed my teen years, and certainly didn't feel like I was missing out at the time, so why should I feel unfilled now that I'm in my early 20s? It makes no sense. I may not have any memories or stories to tell about parties/drinking/sex/etc., but what I do have is an extremely well developed sense of individuality. A lack of social interaction leaves plenty of time for introspection and personal development; I've never felt the need to follow any herd, and I'm pretty much immune to peer pressure. There's no shame in having forgone a decade of high-risk behaviours and shallow relationships. It just doesn't appeal to some people.