With suicide there are no do-overs.
I am sure poll results here on Susan's will resemble that of my TG support group in that the overwhelming majority when looking into the eyes of that same beast you are realized that there is another much more viable option. Scarier by far. Full of infinite unknowns. Also means facing up to the demons that plagued your life forever. That solution is to see how transitioning may bring happiness back into your life.
For many transition also meant making that choice between themselves or their marriage. Once the cat is out of the bag, a non-supportive, if not hostile, spouse will not go back thinking how wonderful and "manly" you were. Essentially no do-overs there either.
Even in my case with a supportive wife, and one who values my life and happiness above hers, as I feel about her, if I decide to transition to full-time there is no guarantee we'll stay together. Case in point from yesterday afternoon she said "... and staying in relationships I know are bad for me"
Go ahead twist that guilt knife a bit more why don't you.