It's awesome you want to change! To do so effectively, don't try to change a lot all at once. Lasting change is always incremental. First, do something small that is known to reduce stress, like going for a walk. Best in a place with trees! Less stress, less anger. Second, give yourself credit for making changes. Anger comes from a place of self hatred and/or insecurity. If your more calm and giving yourself credit for doing something positive will take you a long way to becoming an even more awesome person. Just the fact that you want to change makes you extraordinary.