Divorce advice (4 years of marriage)

I'm married for 4 years now and have a 2 year old son. It was a love cum arrange marriage. I never wanted to marry her but it was too late to step back then. My wife has a history of being short-tempered and rude to a lot of people. In fact, she has so high ego and attitude that she won't even talk to his real brother. Now, my issue is that she fights a lot with me. Abuses me, talks shit about my family. My parents left me because of her. I'm bound with her because of my kid. I need help to get rid of this lady but I feel my son would be unsafe with her. Her nature is such that she can create a huge drama on the road. In past 2-3 years, I've slapped her also but I don't do that anymore as I've understood that it is better to remain silent.