Am I overthinking or is it real?

Yes. It happens, and with a lot of us. We sometimes think we are overthinking, but that doesn't mean that it is real. 

Just think you have been giving so much of your time to overthink something, and what exactly happens is the complete opposite of that, then you start again overthinking, and it becomes a loop in itself. Let things happen and stop overthinking because you are wasting your time on things or situations that are outside your control completely.

So, the next time you try to overthink, just calm down yourself and get some fresh air.