Never apologize for showing feeling. When you do so, you apologize for the truth.
Over the last couple years, I’ve attempted to get in touch with how I really feel about situations and how to voice those emotions. I’m not a yeller, but I’m very up front with what I think. Note, I said “think” not “feel.” Most of the time, people could really care less about what you think, but they do care about how something makes you feel when you are in an argument.
I often apologize for being too honest, and I catch myself apologizing for someone making me feel a certain way. That’s not my fault. Maybe it’s my fault for not removing myself from the equation, but my emotions are real and a direct effect of my situation.
Therefore, you shouldn’t apologize for that. Apologize for your actions or your big mouth, but NEVER for the way you feel.