Hurt people hurt people, however healed people heal people. If you work on your issues and work towards healing, you will feel able to go out into the world and spread that good energy that comes from you feeling healed.
Beating yourself up over lashing out at someone isn’t going to help you or the person you hurt. Instead, take responsibility for your actions, apologise sincerely (because if they matter, you truly will be sorry) and keep moving forward.
Holding onto anger is like grasping a hot coal with the intention of throwing it at someone else; you are the one getting burned.
It’s impossible for you to control someone else’s emotions. Don’t let someone who is angry ruin your day. Choose kindness and act with compassion.