sex life is boring!

Okay ladies so I'm wanting to spice up my sex life. I'm not down for doing anal ANYTHING. The thought itself scares me! Lol but I feel like every time me and my so have sex he gets off and I don't. He doesn't go down on me either. It's always me giving him his satisfaction and then us having sex. We have tried different positions and we've used a "dick ring" (vibrates on the clit) and that was okay but he didn't like it. I've never really ventured out with my sex life due to being shy and uncomfortable with my body. I am ashamed of being on top because of my body. He's been with itty bitty skinny girls before me & I'm the biggest he's ever been  ith. I weigh 165.5 & he is 145.0 i guess my main questions are: 1. What's some good ways of spicing up the sex life!? And 2. How do I build up the confidence to have fun & enjoy it completely?!