Try meeting people and hanging out more. You have a notion of Love being this flash feeling that you fall into… that’s not what love is, that’s Attraction.
Love can start small and grow over time as you spend time together, learn each other’s idiosyncrasies, quirks and habits. Don’t expect love will be this huge earth shattering revelation. These can happen and are fun, but once again - Attraction, not love. May turn into love over time, or burn bright and fast.
Don’t let your imaginary character stop you from spending time with real people. Just be ready for them not to be like her, and try to be curious about what other types of humans are out there by spending meaningful time with them. They may never match your imaginary girl on many levels, but you’ll find they have other qualities on offer, and perhaps some of them will become a part of your life too.
Worst case scenario is you will learn more about people.