I think there are 2 separate issues here that are related but not the same.
First issue: Your boyfriend is ignoring your sexual needs and just going right for sex. This is a real problem. Obviously your boyfriend needs to do more. He knows that you are unhappy with the current sexual situation and yet he keeps doing the thing that makes only hm happy. That's pretty shitty.
The second issue is a case of you being shitty. You need to stop pressuring your boyfriend to do something he's not comfortable with. He's not comfortable going down on you and that's the end of the conversation. If this was a guy posting about pressuring his girlfriend into doing anal, we'd all tell him to fuck off. So I'm telling you to cut that shit out man.
Nobody should have to do something they're not comfortable doing in bed. I understand that it is very frustrating because you feel like you're giving and he's not. It seems like a misconception to me. Even if you give him oral seven times a day. It doesn't matter that you're willing to give him oral, because it's something that you are comfortable with. Giving oral is something that he is not comfortable with yet. Sex is not a contract, there is no equivalency.
Someday he may be comfortable with it, maybe he never will be. That's not something you can decide for him. You can break up with him over this or accept that it's out of your hands.
What you can do is find some foreplay that you both like and ask for more of that. Just because he's uncomfortable doing one thing means that he gets to bail on all the others. You are well within your relationship rights to ask for something he's comfortable doing that you feel you don't get enough of.