If you have been depressed/suicidal for a long time, and have tried every other option to get out of it, to the point where you 100% have no hope that you can get any value out of life anymore, then I think CTB could make sense in those circumstances.
HOWEVER I would not CTB on impulse or just because one or a few bad things have happened to you. Or if you haven't tried other solutions like getting help. Or if you have any doubts whatsoever. In that case I believe you should try your best to fix things. The option to CTB will always be there later in life.
If you're at a low point in life, you could be at a high point later, life is just unpredictable that way especially if you're a young person.