Here is one way to understand stress and work to master it, the ABC approach.
A, the activating event: A little old lady jumps ahead of you in line at the grocery store.
If B is "How rude! She is completely inconsiderate."
Then, C is likely to be a response that is angry and emotional.
BUT, if B is "How cute, she is so old, she doesn't realize she jumped ahead of me. It reminds me of my grandma."
Then C is likely to be a response that is warm and endearing to the little old lady.
Try to work with beliefs (or attitudes) that are empathetic to others and less judgmental.