Try to focus on real-life relationships and activities. Meeting new people and getting involved in hobbies can shift your attention away from fictional characters.
You could try to balance your interest in the fictional character with real-world relationships. Don't let it consume you. Maybe even talk to a friend or a therapist about how you're feeling to get some different perspectives.
Yes, it is. Loving a fictional character can give you a sense of comfort, inspiration, and a place to retreat when you need it. It's a personal choice that doesn't have to make sense to others as long as it makes you happy.