Thinking of quitting my job

I've been an admin assistant to a owner/broker of a real estate office since February. I'm licensed so I do my own sales too (I only sold one house this year and a handful of rentals that only pay a few hundred). But I'm at a good salary of 30k per year. 
I have never not had a job without a guaranteed paycheck before, so it is honestly frustrating on what to do... 
My boss/broker is 100% disrespectful. When you go to talk to him, he never looks at you (eyes glued to his computer screen) but that's not even it. He always screams at me about things like I'm not doing my job correctly and I actually am. Today, I made one minor mistake and he came In my room and roasted me for 5 minutes. When he hired me, the whole town (this is a small town) warned me of his reputation and that he is NOT easy to work for but I never expected this. He literally made me cry today. I'm not a stupid worker, I have about 8 years relevant experience and never had an issue like this with an employer. 
My dilemma is im not sure if I should quit and really try to just do my own thing as an independent real estate agent without a guaranteed paycheck. I know money isn't everything but I have bills to pay. I'm off for the next two days and seriously contemplating on if I should just quit and never go back.