Yeah, sorry AphexSam, but your post actually is a little bit absurd, given the context of much of the population here. See, most of us are, socially, late bloomers. Your benchmarks generally beat ours by quite a bit. So it's sorta like complaining about having a dorky looking car to people who have to ride the bus.
To wit, when I was your age, I'd kissed zero girls. Although I'm glad to say that does not accurately describe my fortunes now.
As for your comment about your friends in long-term relationships... Just to give you a little bit of perspective, that's not common to have an actual long-term relationship in high school. Pretty few people stay with their high-school gf/bf once graduation and college rolls around. To be quite blunt, relationships at your age are very temporary, and more like practice. It gets a lot more 'real' when you get out into independent living. Dating in your life now is nothing like dating you'll see in 5 years.
So, in closing, don't sweat it. You're fine. Even if you don't feel attachment to any girls around you, it's not that big a deal.
Just keep it in mind for later, because down the road, once you get into 20's, that's when it's going to matter, that's when things get serious.