Porn addiction

Is it unusual that I am uncomfortable when my boyfriend constantly watches / masturbates to porn. Like wtf am I here for then, ya know? I think it stems from this one time of me walking in on him after we tried doing stuff in the shower and he told me to leave just so he could jerk of to some porn to finish.

Like that was disturbing for me. And I wish it wasn’t. I wish I was completely okay with it, but it’s just discomforting.. and ngl I kinda get annoyed by it. (I know porn and masturbation is completely normal and probably good for you) but gahdamn, grow up! He knows he’s addicted, & Maybe it’s a lack of maturity? Anyways, what do I do???

Why can’t I accept it ? Help.