I'm married to 2 men. Last marriage is in nc to a soldier. We have a son together. What are the consequences?

Married second husband due to lack of health insurance. We got pregnant soon after dating and first husband and I hadn't been in contAct. First husbAnd still won't divorce me and I'm too scared to file What can I do? How do I protect my son from his abusive and neglectful father? I feel like I'm stuck in a place where I'd never want to be playing the role of a happy house wife