I need to fit in more! How can I get people to be more interested in me?

This is complicated, it's hard for me to understand it let alone explain it, let alone you understand it! But here goes. I used to be a shy and quiet person until half a year ago I woke up one morning and decided to change, and I have. I am now a much more confident person and I can talk to anyone. I am a different person. BUT The problem I have now is that I don't feel that I'm like everyone else. I have about two friends that I have known since primary school, often if one of them has something interesting to say e.g "I punched a teacher in the face" they would direct it at the other one not me! That's only the start of my problems. Were 16 now and everyone in our year "mingles" more. My two best friends have been making friends and talking to more and more people for a long time. I have done the same but no one seems as interested in me as them. Most lunch times at school a large proportion of year 11's hang around in the same place which is half outside and half in a corridor. The people there sometimes stick to a group but sometimes leave and talk to other people. No one is interested in me. I try to stay away from my best friends sometimes because they are often with people I don't like. There are other people I know because I've seen them outside school and stuff If I try to join there "circle" It just doesn't work, I'm never a part of it. I try to join in with what their talking about but I can't because A. I don't know what their talking about, and B. They are not interested in me. My best friend Sam is not so different from me, he isn't shy but he's quite quiet and he doesn't always pay attention to whats going on, he also doesn't touch other boys and pratt around like everyone else but people are ALOT more interested in him than me! Why? I go into town most Saturdays with a group of people, they often walk in a line and ignore me completely! I can't exactly walk on the end and join in because I'm likely to walk into some old woman and/or get run over. There would have been a time when I wouldn't have cared much about this but not now, I want to be the same as everyone else. I can't work out if it's something I'm doing wrong or if it's everyone else's fault. I NEED to fit in, what else can I do to make this happen? There is no one in school like me even my best friends don't really care about me.