The ability to give a gentle answer in the face of an angry confrontation is a sign of deep character. Patience recognizes that a violent temper makes matters worse. "A gentle answer turns away wrath, but a harsh word stirs up anger."
"The tongue that brings healing is a tree of life, but a deceitful tongue crushes the spirit."
"A quick tempered man does foolish things and a crafty man is hated."
"He who guards his mouth and his tongue keeps himself from calamity."
Feelings are healthy and telling others how we feel is appropriate. How you do that however, should be with more patience and less anger consistent with the wisdom described in Proverbs.