Hey dude. I don't know you at all but I can promise you it gets better. Not right away. And not without effort on your behalf but it can get better.
Your little girl won't understand. She's going to have questions for the rest of her life that she can't ask because you won't be around to answer them.
I was right where you are right now a couple years ago. I'm talking blitzed out of my mind sitting on the edge of a bridge ready to jump.
I completely understand wanting to check out. I've been there. But the ones who love you will never recover.
I've seen too many peoples lives permanently change forever because someone close to them killed themselves.
Please don't do it. Go hug your daughter and make sure she grows up feeling safe and loves.