That's why I prefer narration in 1st person.
It's simply easier to manage.
The character whose perspective we follow (usually the protagonist) not only knows how he is feeling at the moment (I.e. I am sad) but could also very easily make an inaccurate assessment of themselves (i.e. I am not easy to anger)
If you write from the perspective of the protagonist and he says (even to himself):
"I am not easy to anger." ... and then he gets angry anyway...
...then's it is considerably more acceptable (even if he lies) than the same done in 3rd person.
"John was difficult to anger." The claim in 3rd person would always, always be regarded as "telling, not showing"
If you write in 1st person, you would have either complain:
A) Not consistent (which is because the readers couldn't comprehend an unreliable narrator)
or
B) Self-insert (because readers don't know that 1st person doesn't equal self-insert and rarely knows what self-insert actually is)
If you write in 3rd person you will always, always get:
"Show not tell"