Spicing up the bedroom life!

Kelsey.
So I have the sex drive of a 18year old male, and my boyfriend does not disappoint. But we have been doing the same few positions constantly. I don't want to make him feel bad or inattiquit, but how would you ask to spice it up, and any easy new positions to share?
Would you take the lead to change up the bedroom life? Or let him know you want some more challenging routine?