No experience. Help?

Being sexually abused has left it's mark on me. Its been a long journey to recovering, and I'm slowly getting there.

I've finally gotten to the point where I'm comfortable having sex with my husband, and lately I've been wanting it ALL THE TIME. And while the sex is amazing, let's face it...the same 3 positions over and over again get kinda...repetitive. borderline boring.

And that's the dilemma.

He wants me to come up with things that I want to try. I don't have any experience and frankly, I'm not comfortable doing that. He says think of things that I think will feel good...How the hell am I supposed to know?? He says use my imagination. Um....I don't have one. As lame as that sounds, I can't look at porn or at a position and imagine how that would feel...I can't. I've tried. And I'm getting frustrated because he WONT help me. He keeps saying how only I know what I might like and I DONT KNOW. he has so much more experience than me, but he refuses to offer any suggestions or anything...I've literally begged him to help me and he won't. He just says I have to figure out what I like.

So now we aren't having sex at all, because I don't know what I want and I know he's just as bored as I am with the same old routines.

What do I do? Why is this such a big deal?? I'm so aggravated and feeling like a complete failure because I just can't do what he expects me to, and every time we talk about it, we just keep going around in the same circle until I finally get so upset that I just give up. Help? Please?