Stalker? Or crazy?

I've been talking to this guy for a while and we like actually "clicked" he felt this way too. I'm 14 and he's 25. He knows my real age that's why we didn't do anything serious. I fell for him really badly and we stopped talking a month ago. I still have the biggest feelings for him and like in my head I keep imagining or like thinking of these scenarios in my head and they don't stop. I feel crazy. Like us cuddling, having a child, building a life, things like that. Am I the only one?