I know exactly what you're going through, because I'm going through a similar situation at the moment. I'm currently in my final year of high school, and I'm just realizing how divided my friends and I are going to become, as a result I've been pushing myself away from them. Everyone is separating, and as scary as it is - I'm also afraid of being alone.

Much like you, I also lack of any sort relationship or kissing experience; but when you look at the big picture, the majority of people our age don't have any real experience in that sort of thing either, and that's okay. When you reach college, your open to a whole new pool of people; people you've never had the chance to meet. And thus, your potential dating and friend pool will dramatically increase.

Don't worry so much about getting a girlfriend. If you focus so hard on simply having one instead of finding someone you care for, things won't end well for you; take that from someone with experience on the matter (AKA three "relationships" that all lasted less than a week during my first two years of high school because I was so desperate to have a boyfriend). My friends are all getting "promise" rings and have been in serious relationships for multiple years now, so trust me, I get the whole being unable to relate thing to a T.

The best thing I can tell you to do is explore other areas of interest you have. Maybe if there's a gaming club in your school - try out going there for a day or two to meet some more people, or even make small talk with people in your classes. I understand it can be scary, but 99% of the time it ends with you making a new friend. I've also made a lot more friends than I thought I would be also attending orientations for the colleges I am interested in, including the one I'll be attending next year.

Things may seem dim now, but I promise they will get better if you put effort in to socialize a bit more - as cheesy as that sounds. Besides, you can still always communicate with your friends via Facebook and IM. :)