I was much the same way, and I suppose I still am, but I have learned not to confuse sexual fantasies with real life relationships. If every one of us acted on our deepest, darkest fetishes the world might fall into a further chaotic state than it already is. You have to come to an understanding that human brains are incredibly complex, and having sex with a partner, especially for women, is often a separate thing than what is going through our brains. It is physically pleasurable, we can be in love with the person, but our minds are in a separate fantasy that allows us to 'reach the peak' so to speak. Just because someone likes tentacle porn doesn't mean their sexual orientation is 'octopus-sexual.'
The majority of my relationships have been with men, but my fantasies and the porn I watch are a much larger spectrum. Lately however, I have been exploring 'fan fiction,' which actually might help you if you want to reorient your fantasies so to speak. Personally I write about certain characters that I find physically attractive and I explore them more deeply as people, create my own fantasies, but there is plenty of already-written fan fiction out there, probably about many of your celebrity crushes that might turn you on.
On the other hand, if you continue to stress over this, your brain might go into obsession mode. You should allow yourself to enjoy what you enjoy without believing there is a requirement to change your entire lifestyle around it. Good luck!