Bf is a selfish lover.. turned off

So my bf and I of 3 years now have a pretty good relationship between us. The only problem is that my boyfriend is so selfish when it comes to pleasure. For example, back rubs, massages, sex, everything is usually about him and if he gets off he's fine with it. Yes, it takes me forever to reach climax and usually I'd need clitorial stimulating for that to happen. How can I address that it's not all about his wants and needs and that my own needs and wants are important as well in our relationship? Of course I have brought this up a few times since we have been together but nothing really has changed.

~ Thank you