so it sounds like you issues being assertive. the problem with waiting until youre angry is that things dont always come out the best way and that others involved in the argument arent in the best emotional place either and this could lead to miscommunication and hurt feelings.

but there is nothing wrong with expressing your feelings. youre entitled to feel the way you feel. there is a simple formula to getting your feelings expressed, cheesy as it may be. it is by using an "i statment."

i feel.....(insert feeling)
when....(insert behavior,situation that causes you to feel way you do)
because....(explains why this causes you to feel way you do)
what i would like is....(explain how your needs can be met)

this formula clearly communicates to another individual what you are feeling, why, and what your needs are. You are not accusing or blaming when you use it, just simply stating feelings, facts and your needs. We tend to leave this stuff out when we are angry and things tend to come off as blame when we are angry. These statements dont come off that way. and you cant say...i feel YOU...you have to follow i feel with a feeling....

try it. see if it works.