I think most people thinking about ctb and even who want to ctb and have made a decision that seems rational to them, then have some degree of fear that it won't work. I'm sure if you asked most people here, they'd say the most important thing to them is to either ctb successfully or not do it - making a failed attempt would be worse than the current situation, and that is probably a common fear. Certainly for me it's actually my worst fear.
If you feel you absolutely must ctb, then you must plan and be ready. It's not something you can do on impulse and you do need to be sure, as much as you can, before doing it. If you feel you have no choice but to ctb it's not the same as actively wanting it - you probably still, deep down, have reservations.
If you do, you shouldn't make an attempt. Work through those feelings to decide what you want and maybe, if you can, try to make some drastic changes to your life (like move to a new place, perhaps... what's it matter if it either works or doesn't and you ctb - you have not moved backwards) to see if you feel better first. Try everything you can and, even if it doesn't work, it removes your doubt.
I don't mean this to read as flippant - I am so sorry about your situation, and it does sound difficult. I understand you must find life not at all easy.