I can say I was in the same spot as you, depressed no friends ( i really had 0 friends ) anxiety did not go out from house, litteraly had no purpose of my life..
What I did was that I started to focus on what I wanted to do in life (well hard to answer that if you dont know what to do right? ) so I got into different jobs, focused on my career, on myself untill i could say to myself what i liked to do. I started off in a car factory and moved from there to being a salesman and from there to being a an ride operator ( only 2 per year become operators, and by a team of 10 with ages between 28-30 i was the only guy being 19 years old, * im 20 now.)
in one of the biggest amusement parks in europe, tough /komplex job i have to say..
Anyway what il trying to get to is that you need purpose in life, look around you, what do you value? Family? Helping people? Money? Education? Career? Making a name for yourself?
The world is yours man just go get it. Clock is ticking...
If i could take me out of it, so can you, by what i have read you seem pretty more ahead of me than i ever was in that point. My father died, grandmother dies same year i got depressed and it made it worse... ( i was 18, this was 2 years ago)
I got out of it, im sleeping with girls, got quality friends ,making alot of money while being 20 years old now, working in a top notch job in a city with 4 millon people whom i got with nothing but myself and my own skills, ( i was not a social pro ) my biggest sucess factor? I had a purpose. I fought freaking really hard for that and it was damn worth it.
Purpose man, find it- keep it, it is what drives you, gives motivation, think of the people who died in paris 13/11, live in the moment ( those people didnt know they were gonna die that day, so seize every day of your life cuz you never know whats gonna happen) and read alot of girlschase ( damn it helps) .
I just made this account in order to respond to this post
Cheers going to sleep now really tired and sry for my english
And dont give up, you will f***king make it if i made it.