Spice things up?

I'm 25 and have never been a super sexual person/experimented much. I'm not super open or talkative either and I'm plus sized so I have some self image issues. I feel bad for my husband because it seems like I'm never really in the mood for sex. Like I can go weeks without and be just fine and if he had it his way it'd be every day sometimes multiple times a day. He's even less experienced than I am and I think he'd only been with one girl before meeting me. Any tips on improving my sex drive and spicing things up a bit? I did get him to use my vibrator on me one night 🤷