As i mentioned in my comment, the usage depends in reference to the context of where it is used. That said, the mind is an abstract thing and can mean different things in different contexts and can be described in. For the usage you are, you're gonna is more common.
In the song you're so vain carly simons says: Both sentences are grammatically correct and can be used. It's just colloquial english, that's all.
It represents an action that is happening now and might continue in the near future. Otherwise, we say something is in my mind to denote that we have remembered something but it is not at the forefront of our thoughts. Your grace is for dukes and duchesses; I don't really understand the rubber and glue reference in the idiom:
They're definitely different in that you use them for different people! You are is normally contracted to you're in speech, because english doesn't like two vowels without a consonant to separate them, and one of them gets deleted. We can schedule a call when you are free or we can schedule a call whenever you are free what's the difference? This sentence uses present continuous tense.
The same thing applies to i'm, he's, she's, we're, and they're, among other contractions. Since as we all know glue does stick on rubber. Either you're or you are can be used; But then again, it depends on where you are using it.
I got a text from a us native saying: And i hope you keep doing well are they essentially the same thing? Your (royal) highness is for princes, princesses, their spouses, etc. Where is better to use swell instead of well?
Your majesty is for the king and queen; `hope everything is going swell' i had never heard that before. Is it better to say in a professional email: I hope you are keeping well.
You walked into the party like you were walking on a yacht your hat strategically dipped below one eye your scarf, it was apricot you had o. You gonna is not unheard of but it's pretty sloppy.