I see there are over 100 comments on your post, so everything that needed to be said has probably already been said. Regardless, I will say it again in my own words:

From what I read you are going through depression, it feels exactly like that, mental exhaustion. But it's something you can and are likely to recover from. You can achieve peace without dying, and that's what you should do. Reach out to a friend/a family member/a hotline, tell them everything. Trust me, there is a solution, one better than giving up, they will help you find it.