As someone with severe depression disorder, I feel compelled to comment. I have attempted suicide before. I want you to know, things get better. But they don't get better until you want them to. You need therapy and medication. I know that, because this looks very similar to how I spoke after my fiancé broke off our engagement and before I tried to kill myself. There are several mental health resources alongside VRCs (vocational rehabilitation counselors, they help get you on your feet with work) that want to help you. There's also no shame in checking yourself in somewhere. I've done my stint in a padded room, it's kinda awful NGL, but I'm better for it.
Also, jumping from a bridge is a terrible way to go. You will be left with time to regret. I downed a bottle of oxy with a fifth of whiskey being finished on the day. I remember laying on the cold of the black leather couch, after I had moved back in with my mother, my final act of desperation. Looking at the TV as strangely my vision started to darken and I couldn't stop it. I suddenly realized, I didn't want to die, but it was too late. I woke up to my mother slapping my face, crying, screaming what have you done. I was covered in my own vomit. I don't know why I survived, one doctor told me I should be dead. But I'm not. I'm happily married now, I have my own family that loves me and every day is hard, but better than then. You will be able to get through this.
Lastly, do not jump off a bridge. Finding a body in water, or cleaning off the pavement, is a horrifying thing for another human being to discover. Heroin is going to lead you down a similar path to my experience, and if it doesn't work and you don't OD, that wake up experience is grueling. I have a sure fire way to kill myself that won't hurt while dying, or give me time to change my mind. I just would slowly fade into sleep, peacefully, blissfully, and never wake up. And no one would even know. The autopsy would show nothing other than I just stopped breathing and died. But I don't even think about it anymore, because I'm on heavy medication and I see a shrink once a week.
Just, don't. okay? There is enough death in this world. There is enough sadness. Let us try to bring joy and find joy in everything we do and see. I love you, I care for you, and I will pray for you. May many blessings fall upon you and may you find peace within suffering.