Hi Joel,
I wage battles against fear myself, so I can relate somewhat to your post.
You asked what is the opposite of fear, and I think that all of your answers fit that description. I think trust is also an antidote to fear. Optimism, acceptance of what is beyond our control, and trust that we will be okay. When I say trust, I'm not talking about a blind faith in something mystical or mysterious. I think (this is a work in progress for me) that it involves first trusting ourselves, trusting that we're going to screw up from time to time but that we'll still pick ourselves up and continue on. I think teejay mentioned attitude; our perception of life and its happenings play a major role in happiness.
Trusting myself and then, by extension, trusting others is a very difficult thing for me. But I believe that trust is a choice we make, a risk if you will, the we consciously decide to take. Sometimes, we're going to trust unwisely and get hurt but without the risk, there isn't any gain. I'd rather go thru life trusting and being hurt occasionally than closing myself off and never taking those risks, even tho at times it scares me to death.
After I left the JWs, I decided that I would never again let fear be the basis for my decisions and actions. I had plenty of that as a witness! I'm not perfect at it but at least I'm aware of my feelings and whenever I'm feeling fearful, I try to examine what it is that I'm afraid of. Face your fears, dear Joel, and don't let them stop you from living life to the full. Often, what we are afraid of turns out to be much less debilitating than the actual fear itself.
I've rambled enough here! Sorry bout that
Take care,
Dana