How to do more?

So I’ve been having sex with the same person since December 2017.. and since we’ve started it’s always been the same .. missionary or doggy style .. I’m not complaining about the sex itself .. I just feel like it’s boring and I’ve done more in the past. I only have 1 previous sex partner but SIZE DOES MATTER. My other sex partner and I were way more intimate but he was so much smaller than my current. We use to have sex in the shower , floor , sofa , I’d ride him forward & backwards.. he could pick me up and everything.. I don’t even know how to ask or introduce something different to my current. I’m really passive in bed because I’m low key shy and inexperienced...but I want to do other things