I've never been one who enjoys it.... But he does

My boyfriend has started pushing the subject of oral sex. I don't mind giving it, however receiving it is another story. That's what he is wanting though. I have had it done before but it is always something that has made me uncomfortable . He says he enjoys it though and would love to be able to do it.... What do I do???? I'm afraid it won't be what he wants and that he won't enjoy it as much as he thinks he will.