swear my brain will make something out of anything

I know the solution is to always say “yeah that could be true, but I am choosing to live my life anyway.” However, I feel like my biggest issue is my brain always assuming that it is immediately true when I do that. Like if I say “maybe I’m attracted to teenagers, it’s possible,” then my brain INSTANTLY starts rationalizing that thought and defending it and being like “oh okay so you think this now and it makes sense because xyz, and now that’s who you are and your real desire is now and always will be teenagers.” I feel really alone in this area of feeling like my brain “accepting the thoughts” means my brain immediately accepts them as true. I obviously don’t want to think they’re true but I feel so stuck now.

sometimes my brain is thinking of every thought you could have all at once and it makes me insane and i keep telling myself in my head to shut up and i try to stop thinking but it doesn’t stop

even a word, or if I read a word that describes an intimate organ is a trigger for my thoughts (images), it even gives me groin..how many more of this😑!?!?