Welcome!
Seems to me that you know what you want, you just want someone to tell you that it is okay. Well, I will tell you that wanting a better life for yourself and your son is okay, how you go about it is up to you. I left my exah,not because I wanted to, but because I wanted better for my children, I have 3 with my ex. I will tell you that it has been a long hard road, I lean on Allanon SR and most of all my family and friends. I sold my home,went on food stamps and public assistance, went back to school and now I'm working full time and supporting myself... It is a long road but I feel great. 2 of my children have a relationship with their father 1 does not, (she is 19 & has made this her choice). The bottom line is that it is your choice to leave.. sounds like you have great support. Good luck and again welcome.