Accept it. Life is hard and everything you do seems repetitive and not meaningful, then so fucking be it. Excuse my language, but that's by far the best method on how to keep myself alive. Maybe your life just meant to be like that and that's okay, keep doing your thing. You just have to accept that this is the life you live and it's not the one you wish to be. Be greatful to what you have and start noticing and appreciate the little things that makes your life a little enjoyable. You only have one lifetime so why want to ended it so soon?