Blow jobs?

So, my boyfriend regularly goes down on me and he enjoys it just as much as i do but i hate going down on him. Its always uncomfortable on my neck and back and its 8 inches so i gag halfway down. Its difficult for me to use my mouth and my hands at the same time.

Also, he doesn't shower regularly and i dont like the smell or the taste, even freshly showered. It is affecting our sex life and any time he brings it up it makes me uncomfortable and i feel bad. I usually shut down and start cleaning something.

We have tried flavored lube and things like that but it doesn't make it at all more appealing.

Any advice would be greatly appreciated!