Why doesn't my husband turn me on?

[Nicole]

I have been married four years now, no children. My husband is the first and only man I have ever been with. I feel like I am a very sexual person but I don't want my husband. He is predictable and boring, he doesn't like to try anything out of the ordinary positions and I never get the O during sex. It starts out okay sometimes but then I get bored and basically just wait till its over. I have tried talking to him but he says its just in my head and I need to sort through it. He is always ready but I just consider it a hassle anymore. It's no fun for me. I start to think that I'm missing out on what else is out there especially when other guys give me attention. I love my husband so much, I trust him completely and we have great communication but I can't get over this sex thing. I want one enjoyable sex experience in my life! I feel it would be selfish to leave a good thing for this and now he wants kids, I don't know what to do...
I just wanted to add that my husband is a good looking guy and is plenty endowed. Attraction isn't the problem, it's passion.