It doesn't mean it will never happen. I was bullied throughout school and this left me with severe depression and a backlog of self harm. When i got to uni i did find it hard to talk to people, and my depression worsened to the point of pretty much alcoholism, but it got better. Sitting in your room, you won't have the chances to meet new people. When you go back to college try your hardest to get out there and meet people. I know when you have low self esteem its the hardest thing to do, but you need to help yourself gain more confidence.
As i was saying to my friend last night, if you go out there with the opion and attitude that no-one wants to know you or talk to you, then chances are you're going to be giving off that impression, and people probably will avoid you as they think you'd rather be left alone. But if you can make yourself really believe that you do want to meet people then you may find your demenour changing and find that people see you are more approachable. As far as uni goes it took me till my 3rd year to have realy formed any friendships with my classmates, but it did happen.
Even if you feel liek life is not worth living, i guarentee one day something good will happen, and you'll look back and be so glad you didn't give in. if my suicide attempts had been successful, i would never had got to see my siblings grow up, i'd never have met the love of my life and i'd never had expeirienced all the awesome things that have happened to me in the last few years. I still have depression, but i can feel life is going to get better. And i hope it will for you too.