detaching from unrealistic ideas

I have a very bad habit of getting attached extremely easily to the thought of something or someone that makes me literally go insane. Of course it’s so fun to romanticize things but to a certain extent. It could become very toxic if you’re detaching from your regular life and romanticizing a person or thing to be something they’re not. I’m going to try my best to give some advice for what has helped me this far but I’m still trying to figure it out myself.