You married very young, and it's hard at such an early age to know what kind of person you will develop into, or what you need in a spouse because you just don't have that much adult life experience. Don't beat yourself up. Don't let him threaten (I will hurt or kill myself if you leave) or manipulate (crying, pleading, apologies) you into an unhappy life. It's not good for your son.
My spouse left me and our young son after 10 years, and I wanted to stay married. With time I've realized he did me a favor - I had made far too many compromises - not in things I should compromise in but in my values, priorities, faith and more. If you go now, your son will come to know life post-divorce as his primary memories from childhood and can grow up with a happy mother. My son is fine. We worked through it. It requires both parties to be mature, and if they aren't, at least the custodial parent needs to be mature (that's you if your son will live primarily with you) even in the face of the other person being obnoxious, manipulative, meanspirited or whatever.
In most states, divorce is now no-fault. That means that even if he doesn't want it, you can file and get it. You can get child-support and probably some spousal maintenance if he earns more than you. If it's the other way around, you may have to pay him.
Go to a lawyer. They won't charge you for a first consultation and will give you the basics in terms of what is required of you so you know what to prepare for. If you can't afford a lawyer, there are many legal services for low-income people that are inexpensive or free. Ask around.
It might be best to leave and tell him after you are packed and out only because you make him sound kind of volatile. If you are worried about his wellfare, perhaps talk to one of his family members or friends - someone who is mature and will work with you for the right reasons - and say, "I'm leaving Joe and am not asking you to get involved, but I'm worried about him. Will you please see that he's ok?"
It's really all you can do. Then, try to take the high road - be fair, be reasonable and don't get insulting or let him guilt you into things that are not best for you and your child.
Check into Parents without Partners. It's a group of people who are widowed, divorced or started as single parents. You will probably find a lot of support and good advise, resources and information there.
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