'dating rules' are so fucking stupid btw. "don't talk too much about your hyperfixation on a first date, it'll scare them off!!" it'll only scare them off if they're a coward. Someone worthy of my affections will listen to me talk about my goal of visiting every whale exhibit with a life-sized effigy of a whale in it in the world for a solid half-hour and come away from that experience desiring me carnally.
One time I went on a date with a guy who stared at me with raised eyebrows while I told him about my plan to go to ComicCon as Daphne Blake, and then he scoffed and said it was weird for me to be so into Scooby Doo at the age of 19. Last year I told my boyfriend (before he was my boyfriend) that next time I got ComicCon tickets I wanted to go as Rapunzel, and he gasped and said "NO WAY I WANTED TO GO AS FLYNN RIDER". So, like, not only is talking about your hyperfixations on an early date a good way to learn quickly if someone is going to treat your whole personality with respect or not, you might also find a kindred spirit.
This doesn't just apply to dating btw. Any platonic acquaintance who acts like you're cringe for having a lot of enthusiasm about something is not someone you want in your life. The people who matter will do things that you want to do with you because they love you and like when you are happy. Case in point I could not have paid my high school official-best-friend to spend four and a half hours in London's Natural History Museum taking photos in the whale gallery but my adulthood best friend agreed in a heartbeat despite knowing the bare minimum about whales.
So yeah. Be openly enthusiastic about the things you love and the right people will love you for it.