boyfriend doesn't let me watch porn??

Nina • I give so much advice but I have a hard time listening to it myself😩
My boyfriend gets so mad at me when I watch porn and masturbate. I masturbate sometimes because it's easier to get off real quick other than wait or when he's not able to. And when he's not around then I just watch porn to get in the mood. But he gets so upset with me and he thinks there's an issue with him. What should I do