I'm 17 and I don't know what to do with my life

I''m a 17 y.o student from an EU country. I have no interests - I've never liked sports, arts, or any school subjects. I'm not good at anything. I’ve tried to make friends, but no one’s interested. People see me as boring, and honestly, there’s nothing interesting about me. I'm unattractive - I’ve never had a partner and probably never will.

My family doesn’t care about my life. My parents have made it clear they don’t want anything to do with me once I turn 18. My dad avoids me, and my mom says I'm a failure. But at this point, I don’t mind. I like being alone.

What concerns me is that I have no idea what to do with my life. My family and I will be moving to Germany soon, and I’ll have to repeat a year. I barely speak German, so I’ll probably fail the Abitur. My grades will be terrible, and I probaly won’t get into university. Even if I did, I have no clue what I’d study (again) nothing interests me, no matter how much I try. I’ll soon be an adult with no education, no prospects, and probably homeless.

I’ve been stressed for months. I can’t sleep, I’m tired all day, and I don't feel like eating unless it’s junk food. I’ve thought about offing myself, but I’m too scared to do it. I just want everything to end. I'm jealous of my cousins. They have happy families, money, and bright futures. Meanwhile, I’m just a worthless piece of shit. I have no reason to exist. What am I supposed to do?