Hey I've been in a similar position and it's brutal but it can get better- but you have to make the choice to make it better.
I ended up feeling lonely, like there was nothing I wanted to do, university courses were unappealing and seemed useless, I was dreading just getting a job to pay bills and end up hating my job and life even more. I felt like my relationships and friendships were crap and I didn't know how things would get better.
But they did. I didn't take the conventional route. I tried it, I went to uni, I got a decently paid office job afterwards and I absolutely HATED it!! I quit my job and retrained in a job related to a childhood hobby. And now I enjoy my job, I've met great people through it, it's opened up opportunities the actually look enjoyable to me. I still don't know where life will take me but I feel optimistic about it.
You don't need to have it all planned, because god knows you change as a person and in 5 or 10 years might want different things but if you make decisions that make you happy I don't think you can go far wrong. Don't come up with a master plan. Don't worry if stuff looks impressive. Just put yourself out there and try things- even if you just get a menial job that you don't want forever, it isn't forever and you can see what bits of it you do and don't like.
Nothing is permanent in life, including feeling like you have no passion and purpose