So sorry to hear about how lonely you feel. Making friends is hard for some people. It's not just all about how you look or what you say, there is a whole heap of non-verbal communication going on that sends out signals. Try being conscious of these sorts of things because without you even realizing it you may be sending out signals that are preventing you forming friendships. Could be something as simple as not appearing interested in what someone has to say by looking elsewhere or something like that. It would be worthwhile reading up about body language just to see if there is some gestures or techniques you can use to encourage and foster friendship. Also if your feeling low/depressed, perhaps this demeanor is coming across to other people and they are picking up that you are glum or whatever. Anyway these are just suggestions and possibilities. I can't see what other reasons there could be that prevent you from bonding with people. Also remember that you will have to be somewhat proactive in forming these friendships and may need to take the first step in initiating things. All the best.