You Are Anger
You may not feel like an angry person, but you have a lot to be furious about in your life.
It's likely that you've suffered some great injustices, humiliations, and / or betrayals.
There's nothing wrong with feeling the way you feel, but your anger needs a more healthy outlet.
Instead of being bitter get proactive. Instead of hating, learn to love something in your life. Anger is a difficult emotion to deal with.