I (16M) need help to stop obsessing over her (16F) but it has been happening since my childhood

I have a serious issue with obsessing over people, me and this girl were going so well and we still kinda are but I think i spooked her, well she said i spooked her a little bit from it. She sent me a picture of her and I don't know why but my gut told me to reverse image search it, and boom, its not her, and I got the face picture and ran that too, but that was at least real from what I know. I can't sleep because I'm worried that if I sleep, I'll wake up to being blocked and I don't want to go through that again. I even found myself analyzing a reflection of her tv in a picture to see if she truly is sleeping on a loft bed, I don't know why. She told me that I can spam her because she loves it, and she does read every spam text I send while she's sleeping and responds to most of them. Sorry this is all a mess but I really want to stop being like this, I've been like this ever since my first crush in elementary school, I obsess over them and remember every tiny detail about them and it always pushes them away. I don't know if its some sort of mental illness, I know I'm Bipolar at least but I don't think that this is a symptom of that. I really need help, therapy isn't helping me with this, my medication just make a numb dick head and I don't want to be like that. What do I do?