Yes, I believe it is. The fact they have no contact with you suggests that they have unresolved issues with you, and it probably hurts them too much right now to stay in contact. If you kill yourself before they have the chance to resolve their 'mommy issues' (for lack of a better term), they will never heal.

Kids need to know their parents are there for them, no matter what, even if they aren't in contact. Your daughters, even though they aren't talking to you right now, need to know that you are there, and that they *can* talk to you, if they ever need to. Does that make sense?

Whenever I think about suicide, I think of how it would destroy my mother, and it snaps me out of it.

edit: just read that your kids are 13 and 14....they will definitely want to contact you when they are older. Please don't rob them of that chance. They are just kids. They need you, they need to know you are there, even if you can't be in their lives right now.