I hear you. I tried to kill myself when I was 17. It obviously didn't work. I promised I wouldn't try it again, but yeah, I'd rather cut to the chase and be with God now than 'persevere' in this forsaken world as God says it for another day. Yet persevere I do and will continue to.
That's not to say that God hasn't used me since that attempt to help others. He'll use you too if you give Him a chance. Oh sure you'll still be stuck in this pit, but God likes it when we help make another's pit a little less deep. That's call banking up on the other side. And every day you suffer this pit for Him, you bank more. So really, by killing yourself now, you cheat yourself out of the opportunity to bank up in the bank of God.
So grit your teeth, persevere thru, and every morning ask yourself how much you're going to bank up today for the other side. And who knows, there may be days when you get to make a deposit in someone else's account too. You'll still be in this cesspool, but know that you will be washed clean if you persevere thru.