​I have one child; how can I leave him? Is it possible

“I marry to an abusive man and after then I realised this only after being married for two years and when I was pregnant with his child. I realised in my mind I would petition to court for a divorce once my son grows up. Now he is a 21-year-old man, really I don’t see the futility of moving away from his father (my husband) with whom I have spent my time more than two decades.”