^Kruella's advice is very good.
Smiling more, working on yourself to increase your confidence, being active, getting out of your comfort zone... all this will help you to become more attractive to others. I am really good in socialising in some environments but in class (and in other situations) I had lots of difficulties and I didn't understand why. It turned out that I looked to serious (because this is how I look when I'm very focused). I also lacked confidence and I've been working on it. Look on the Internet for advice on 'how to stop being self conscious'!
Sometimes, when I sit next to someone new I just ask his/her name and ask for he/she comes from and maybe some other question or make a comment just to break the ice. Then if the conversation flows perfect, if not just don't force it, do your stuff and maybe later you or the other person will find sth else to say. Sometimes people can be very dry, but I don't let it affect me because I don't think it's my problem. All the awkward moments are worth it for when it goes well and you meet nice and responsive people.
Tbh, I also found out that I'm simply not interested about many people in my class and that I make less friends now than when I was a kid because I'm more selective. I like it that way
To gain more confidence I'm planning to do this project with my sister next term:
http://www.reddit.com/r/howtonotgive...sort=new&t=all
Also, a TED talk that I found super useful and made me change my attitude is about body language:
https://www.youtube.com/watch?v=Ks-_Mh1QhMc You can do so much by just changing your posture! I'm much more positive and confident since I watched this.