it's important to work towards creating a space between thoughts/feelings (I feel angry, I feel envious, this person is awful, etc) and reactive behavior (e.g. lashing out at them). work towards processing your thoughts and feelings rather than just immediately reacting.
there's often a lot more lurking beneath the surface than you might initially realize. certain feelings sometimes mask certain other feelings, e.g. anger sometimes masks anxiety, insecurity, fear. there's more to your own thoughts than you see at first glance. explore further.