Going down.

So I'm in an awkward situation and I don't know what to do. Me and my boyfriend have been having sex and it's great, but I wanna ask him to go down on me, but I don't know if that is weird or anything. As well as, I feel a bit selfish because I refuse to go down on him, due to the fact that I find bjs gross and don't like doing them. So if you lovely ladies could help me that would be amazing!