Voice in your relationship

May 2015 would make it 5years that I've been with my partner and as each year go by I feel more and more like I don't have a voice in my relationship. I    Avoid arguments, say just a few word to avoid arguments and keep most  of my opinions to myself. What can I do??? I hate to argue and it seems like wih each year that passes he's getting angrier and angrier????? Help please!!!!