I think I may be only fictionkin, but up until a little while ago I thought I was a therian as well. My best friend is a theriomythic, and also fictionkin, and I don’t know how to explain I think I’m not a therian anymore? I’m afraid he’ll think I’m mucking him around and not taking enough time to think about these things (when, in reality, I do, because this was my worst fear). How do I tell him?
If your friend is seriously therian, then he should applaud you for having the introspection and self-understanding necessary to know when you were wrong about a kintype/theriotype. Tell him you think you were mistaken, and why, and he should accept it.