Most people want to feel useful in life, I think. What I'm trying to let you know is that at 19 you have a lot of life left to be useful.     I really do understand how hard it can be to feel alone. I was homeless when I was 20 and felt much the same as you describe above. I got a job at 21 that enabled me to get a place to live, from there I continued to just try to find some way to be useful and find people that I could 'belong' with. It didn't always work, and it was certainly difficult at times, but there were also lots of little triumphs that helped spur me along.    Don't give up just yet. You really don't know who you're going to be there for later on. That person might make it all worthwhile. It just might take time.