Don't doubt yourself, you have to do it, to have a better life for your son and yourself. You will find a way around it. I have 2 kids 6years and 2 years, i work 20 hour a week, my husband works a lot too. I waited 5 years for my parents to come here so i could go to school. I am just finishing the 1st year in nursing school
. I am tired of course, but it is very possible to finish it. I have single mothers in my class to and they are doing OK. Do not be shy, ask for help.....one of my friends in nursing school, asked her EX-husband that she can't stand to come and watch the kids in the morning, she hates it but she has to do it, she is trying to build a better life for her kids and herself. Nothing is impossible.....you just make it work, and fide a way around it. I wish you good luck, and don't give up i am sure you will regret it. It will be hard, it will hurt, NO-sleep, lots of stress, but there will be light at the end of the tunnel.