Relieving sadness ?

Hi there. I am a student doing my studies overseas. For the past few months here, I kept on having this feeling that I was completely useless and hopeless. It then came to my realization that i was lonely because I wasn't with my siblings. I usually only have my brother to talk to because we like to talk both something in interest, which is computer stuffs. For years, I was with my friends, but I couldn't talk except anything to do with computers. Many people thinks that I was some sort of freak. Always wanted to talk about something else other then computer, but i know i just couldn't do it . Always sitting down with them and kept quiet thinking of what to say . Now worse of all we are at separate ways and have not seen each other for months now.Though i met up with some old friends here, it was not the friends that i thought, who i can depend on. From the time that I came here, I felt completely alone and every night i will keep thinking about many problems such as work, university things, and now with friends. I want to socialize with people, but i just don't know how. I cant live like this for too long. Its just not a good feeling to be alone all by yourself in a confined room. Often at nights, i usually will lye on my bed and then start thinking too much and probably will start crying after that . And sometimes when I go though my friend's Facebook pictures ; it just tells me how much fun they are having and i'm here in my room, just don't know what to do.
What should I do now? - It's already enough stress for me to deal with university's work.