I'm sorry you feel alone and like your family doesn't care. I feel the same way about my family...like they don't care. I have felt that way almost my entire life so I just have lowered my expectations down to the bare bones. I never "expect" them to give a crap so I am never "let down" or hurt. It's easier for me that way. They are all very self-centered people. If I died, they probably wouldn't know either...especially my dad! He's too busy flying all over the world making millions.
As far as loneliness, that's a huge trigger for me too. I have been finding that going to a few AA meetings each week just to be around people who truly understand me and care really has helped. I missed a meeting I usually go to today and several people called and texted me to make sure I was ok. I swear it seems like people in AA care more about me than my bio family!
Anyway...hang in there. For what it's worth...I care about you. :-)