It's extremely tough to not have friends, I can't really say I have any friends, they seem to have drifted away over my life. I know people and have a significant other but not friends.
I accept my situation and live on the periphery of life, someone in my situation can't really make true friends but the occasional interaction has become useful, I study at university so I do have interactions there but no real friendship relations.
I've tried to see the positives in my life but of course there are the days when my depression kicks in, I quit drinking and drugs so I don't have that crutch anymore, being on here can hinder and help, I'm sporadic in my engagement with anything these days and employment is 90% impossible because my past it's difficult to even get a response letter.
I would say hang in there and keep on trying, for me it's not so important as I'm in the Autumn/Winter of my life, I wish you well in you search.