Any Advice Helps (Please)

Hello I am 20 years old and I am in a relationship that I can't get out of, we've been together for 1 year and 8 months and our relationship hasnt always been bad there has been major bumps that I always ignored and I think part of it was we had a baby together who is now 10 months old, though he is a good father sometimes I worry about mine and my childs safety he has a bad temper and will destroy anything in his path and scream and yell in my face while my son is nearby or in my arms and he doesn't care, he's unrelaiable and makes things hard on me. I can't go to my family for a numerous amount of reasons and while I do have a job I only work 2 days a week for 3 hours (I don't always have a babysitter) I don't have any money the little money I do get he takes (mostly for bills) I don't know what to do I'm afraid he will try to take our son if I say I want to leave or wont allow me to leave (he has got physical with me before) please I'm young and I dont know what to do I want my son safe and out of this situation