Welcome to TTL :)
I'm sorry that you've found yourself in such a bad place right now, you're amongst friends here. Many people here have been, or are, in similar positions.
Suicide seems like a quick answer to a whole load of complex problems. However, often it is anything but quick and more people fail than succeed. It's a dangerous thing to try and can leave you far worse off than you were and still very much alive. The body was not designed to expire easily, it's very stubborn and resistant under normal circumstances. There are hardly any suicide methods that can't, and haven't, gone wrong. There are so many variables.
Even putting that aside, suicide is not a solution to anything. It's an end not only to bad but to good. It's an end to everything. Everything that you have fought for you lose. Those who are left behind are left to pick up the pieces and their lives will never be the same. Those who read about your story, or hear about it, are affected. It's sadness from end to end, there is no victory for anyone. Many people feel like their death simply won't matter but that is hardly ever true. You might have no family, no loved ones and you might live in isolation but your death can still affect someone. Someone out there may try and follow your example and another tragedy is born from your own.
I would urge you to fight against this. As bad as your life has been you still have a chance while there is breath in your lungs. Rather than spend your time focusing on the end, try to think of a beginning. Try to think about any one thing that might make a difference, no matter how far away that thing seems to be. Identify it, tell us about it and let's see if we can help you with it. For everything that you have tried in life there are always any number of different angles to try. There are so many strategies for everything that we do in life and you can't possibly think of them all. Other people can give you new perspective.
Hang in there please.