I had a fictional one of my first loves
What do you mean by that?
I liked her so much that I wasted two years on her
I'm still not quite sure what you mean by fictional. That being said, I'm glad you've experienced having someone you love. That's a great thing.
Since I wasn't able to get my ex back, I created a fictional character like her
Oh, so that's what you meant by that!  While It's good that you enjoyed your time with her and remember it so fondly, I think you're hurting your chances at meeting someone else equally special by wasting time on this fictional version of your ex you've created.