With Suicide the fact that the person took there own life is very difficult to live with. With a car accident, cancer, natural causes, etc. It's not that these aren't tragic in themselves, but with these you have an answer. That answer is they didn't "chose" to die.
I know that many who actually go through with suicide have a chemical imbalance and when my brother in law 8 years ago took his own life I don't even have words to describe how me and my family felt.
I know that you are looking for answers on how to leave you family untouched with the pain associated with suicide, but this will never happen. There lives will be forever turned upside down. Sure they will get through everyday life and eventually it is well what it is. That is only because they don’t have a choice except to deal with it. Just because you may know your family will “deal”, still please find a way for this not to be the end of your life. Can I understand what you are going through? No, I can’t and I won’t pretend to. I do however understand what is left for the survivors to deal with and unless anyone has been through it themselves they can’t begin to understand the complete devastation! One never gets over this type of loss, ever. This is my opinion and what I deal with myself everyday. Have I moved on, sure I have. God though there isn’t a day that goes by that I wish there was something I could do to bring him back! I don’t think time heals all. I think that is a load of crap said only to make others feel better! I think that time numbs you a bit to it is all.
I understand that you might be thinking well how do I go through my life in pain, just for the sake of my loved ones. That is a tough one, but all I can say is fight like HELL for your life and the ones closest to you, if they truly love you WILL help you through this. They may not understand fully, but they want to see you happy and will help you in any possible way even if it is just support in your search for happiness.