I'm not sure why, or where it came from, but I have a mental block to topping. When I fantasize about it, I do get excited, but then my mind is like, you can't like that. I have a new boyfriend and we're so close and intimate I know we will take that step soon. How do I overcome this?
I think the best way is to probably tell your boyfriend that you have the mental block. It's understandable to have a mental block about it, but I would be surprised if in the moment that you're faced with your boyfriend's ass that you will run away crying or anything. If your boyfriend knows that you feel really awkward about this, he can comfort you and encourage you. Or maybe I'm underestimating how big this mental block is ...