My girlfriend and I have a 2 year old son and a 6 year old son. The 6 year old is hers from a previous relationship. I desperately want to leave her, as I absolutely cannot stand to look at her or be around her any longer, but I know that there is no chance that I would be awarded custody of my 2 year old. She didn't graduate high school, doesn't have ANY insurance and makes barely over minimum wage. Meanwhile, I've got some college under my belt and I make a decent living. I don't, however, make quite enough money to live on my own AND pay child support. In addition, I fear leaving because she has a history of dating violent drug abusers. Such is the case with our 6-year old's deadbeat dad. I absolutely cannot allow my son to be left in that environment without my supervision. What percentage of my pay should I expect to lose in child support and why is it seemingly impossible for the father to be awarded custody?