Another place could be FanFiction.net. There are many Skyrim - related fanfictions there as well. However, the quality and content can vary widely, so you may need to sift through some stories to find the ones that interest you. Look for the sections related to Skyrim and then narrow down your search to vampire - themed ones.
Find a new hobby that takes up your time. Maybe painting, knitting or learning a new language. When you have other things to occupy your time and mind, you won't be as focused on romance novels.
Well, the allure lies in the unique combination of two very powerful and distinct identities. The Dragonborn is already a sort of chosen one with great power, and adding the vampire element just amps up the cool factor. It can create stories full of moral dilemmas, like whether to embrace the vampiric side for more power or resist it to stay 'good'.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a wide variety of Skyrim OC vampire fanfictions. Just use their search functions and type in relevant keywords like 'Skyrim', 'OC', and 'vampire' to narrow down the results.
One effective way is to expose yourself more to the things that scare you in a controlled way. Read more ghost stories, watch more horror movies related to ghosts. Gradually, you may become desensitized to them and not get so overwhelmed. But this should be done at your own pace and only if you feel comfortable doing so.
One way is to take a break from it. Sometimes, when you've been overexposed to something, stepping away for a while can make you see it with fresh eyes when you come back.
Practice mindfulness. Be more aware of your thoughts and when you start to drift into fictional thinking. Try to bring your focus back to the present moment and the real world around you. This can be as simple as taking a few minutes each day to just observe your surroundings without any fictional overlay.
You could try finding other hobbies or activities that interest you, like sports or reading different types of books. That might help take your mind off the fanfiction.