He wants sex but doesn't pleasure me he is very selfish when it comes to sex. Only good for him

Have you talked to him about it? Does he know what you want? If not, talk to him. If he knows, but still doesn't care about your needs, then maybe he shouldn't be your boyfriend.

How old is he? How old are you? Do you know how to give yourself pleasure? Have you told him what you like, dislike? Have you told him how you feel about sex with him?

So why do you "Service him" unless he is meeting your needs also.

Cut him off, let him walk!!