No-one is obliged to watch X-rated films, or to even enjoy it if they do! Not enjoying porn doesn’t mean that you’re frigid or don’t like sex, just that that particular representation of sex doesn’t correspond to your sexual imagination. If it doesn’t excite you then don’t watch it – even people who do find porn a turn-on may not like the fact.
This doesn’t mean you have any serious underlying issues, it just means that we all have different ideas of what sex should be like and the rather artificial image promoted by the adult entertainment industry doesn’t excite you. It’s perfectly normal not to enjoy porn and is very common in women, who are less visually stimulated than men anyway.