Hi. Just wanted to say I've been in that moment before, and in retrospect wanted to give some advice that may not be the most intuitive.
Most importantly, don't CTB without planning. It can only put you in harms way. The odds of it working are slim as the vast majority of overdoses and suicide attempts fail. You will end up in pain and mentally scarred. Don't even try it. Plan it and you can get what you need in a short time with proper planning.
Secondly, and I know this may be controversial, but don't call the suicide line unless you know how to talk to them when you do OR you are specifically asking for someone to help you not die. Those resources are there for those who want to live but need help and if you want to die and dont want help then it may make it harder for you to properly plan your escape. Saying your suicidal, you will need to eventually convince them you have been helped by whatever they say regardless of it actually helping. Otherwise they are obligated to call authorities if you are at risk and you can also end up in a worse place then you are now, at a mental institution proving your sanity.
I personally believe you are not insane for wanting to die, or feeling that way. If you want help then call. But if you don't want help I advise against all three options. If you had to pick one, regrettably I'd choose #3. If you are set on dying anyways and self harm is all that helps you now, atleast it doesn't deter you later. However it can really make it harder for you to recover if you do change your mind and the scars are a constant reminder of your pain, coming from personal experience and regrets...
Wish you all the peace and love.
