I graduated recently (class of 2013), and I've found that things did get a bit better. I wasn't the "social butterfly" of the class, I wasn't really out going nor a huge party go-er, I didn't hang out with a large group of friends, in fact I started to make friends almost at the end of high school (around 11th grade). I guess you can say I was an average Joe in school. After graduation most of my friends split up, each going their separate ways and me on my own. I felt that I was back where I started. Although we hardly see each other we still keep in touch.
Anyways back to answering your question, for the past, 6 years, (well for me), I've been stuck with the same people in class. Most of them knew me. They knew that I would hardly talk. Once I graduated, I can't describe the relief I felt that I would never see these people again! Just because you didn't make friends in school doesn't mean that you won't ever make a single friend again. School was just temporary, you still have a whole life ahead of you and trust me there's a lot of friendly people out there.