Please please please don't do it. I promise that things WILL get better. Right now things are awful for you but it's not permanent. You are valued and precious and your life means something.

I was in the exact same place you are 3 months ago, and i went inpatient at a psych unit for 3 months. It changed my life. It was literally groundbreaking. I cam't recommend going inpatient when suicidal enough; is there any way you could ask to be admitted?

Do you see a therapist? A crisis team?