I'm so sorry that you are thus point. Life can be so cruel. I'm assuming you'd like a relatively painless, quick death, so I'll list some of those. A gunshot to the head is definitely a top choice, as @chop mentioned. It's easy to obtain in the US but I'm not sure where you're from. However, it can be too gruesome for some people since the aftermath will have your head blasted open. Depends on how comfortable you feel with that. For some people they have no issue, but for others it's what keep them from choosing this method. Another one that you've probably seen mentioned on here is SN. Finding a source can be difficult but it is an effective, quick, "clean" death. Inert gas asphyxiation is also quick, effective, and painless, (if done correctly like most other methods). Takes a bit of setting up but sourcing isn't too difficult. I would definitely check out the megathreads for all of these methods, might clear things up. I hope whatever you decide to do, you can find peace and freedom. All the best,