I can relate pretty much to what you're saying. I also tend to isolate when depressed because I get answers like these from friends and my family is far away too. Try to remember things that you like and that you can do alone. I know how hard it is when nothing seems to make sense, but you have to remember that it won't stay like this and that when feeling better you will ask yourself why you spent your time grieving instead of doing the things you want to get done. Loneliness also uses to get better when you're occupied.

Sometimes nothing helps and you just have to suffer it. I do too. But as long as I can make myself move I try to go out instead. I don't know where you live, but sometimes when I just want to be around people and tell nothing private I go to couchsurfing events as in my city there are a lot of such events.