Plenty of people are able to get excited about their lives. They look forward to the standard milestones - graduation, starting your career, marriage, having kids, retiring. If not that "standard life", then perhaps they get excited to travel, reach the apex of whatever field they're in, get insanely rich, create something, have some alternative lifestyle, etc.

I genuinely just don't look forward to the rest of my life. There's nothing I can think of that would actually excite me/provide any sense of happiness. 

It's not even like my life, from an outsider's POV, is all that bad. I live in Canada, firmly in the middle class. It's not my life that I hate, just myself, if that makes sense. I haven't felt happy or excited for the rest of my life since I was 17, I'm now 25. 

And the thing is, I am somewhat confident in my ability to achieve what I "want" from life, if there was actually something that I wanted out of life. I've proven to myself a few time that I can stick to difficult things and achieve them. But I just don't see the point. Literally nothing I do will ever matter.