There's a Buddhist practice of making a point of asking for compassion. It's a sort of meditation morning meditation where you take some time out and sit quiets and close you eyes and ask for compassion for yourself. If you believe in God, by all means ask it from God, if you have a little quiet place at the center of yourself, ask it from that, ask it from where ever you need to. I like to try to address the Tao, myself, because that's personally meaningful to me. If you're an atheist, ask the cool essence of reason. Whatever you need to address.
Take ten minutes or so, then stop,m open your eyes, and go about your day. After you get some success with this, include the people you're angry with, that you are able to extend some compassion to them. If you're feeling more compassionate about yourself, you'll understand the sense in this more than you do now, and you'll start to feel better generally. Try it at your own pace. Let me know if it does anything for you.
Yours, Bob Kaven