I agree that your T isn't doing a great job being on your side here and you do need to be heard. It's really important to learn to stand up for yourself but if you've been pushed around a lot in life you may have a lot of resentment you are carrying. I am working on that one myself. There are healthy & unhealthy ways of communicating your displeasure to others. If you just blast people then yes your message will be lost in the delivery. Also 80% of communication is nonverbal so delivery counts a lot. One of the most helpful things I've discovered is learning how to speak using I-statements rather than You-statements. It really helps with communicating your feelings and getting away from blaming which doesn't get anywhere. Check out this page on I-statements.
I-Statements