Even though I don’t feel like hitting my two year old, I end up hitting him. How do I make him behave?

Two years old is still at very young to understand your instructions and angers. What have he done to make you angry? You can try to eliminate the triggers first. E.g. Give clearer instructions like please walk slowly, instead of asking him: Don't Run! How to make him behave? You can try to use time-in approach. http://weinholds.org/time-in-techniques/ They are still young and you need to help them to regulate their emotions and guide them slowly.