Can I create scenarios in my head that aren't true and then I get upset about them later?
It sounds whacky. Why don't you give me an example of something you made up that wasn't true?
In my mind I made up a scenario where you treated me badly, because I really need attention from the people around me.
A lot of people make up situations in their head for a lot of different reasons. Most of these are not good though and you should avoid this and keep fact straight in your head.
It would be a good idea if you stopped using your imagination.
You're a riot! Why don't you attempt to imagine only good possibilities and act them out in your head? That's preferable to having bad ideas, and who knows, the more you think about something, the more likely it is to come true.