Hello, Shadow-world!

Personally, I do not believe you are immature. Beyond that, I feel it is rarely useful to examine such issues in terms of maturity-immaturity. I am inclined to view you as a "highly sensitive person" (Google search).

You could easily cease formally communicating your feelings to your superiors and co-workers, but your sensitivity and its associated tears would persist. How long do you think you could hold on in your present environment while seeking another, more sensitive-person-friendly situation?
Rubbish!? You are the same Shadow-world who recently experienced an elevation of spirit in South India. That person -- you -- is certainly not rubbish.

It seems your work superior is sending, or has decided to send the message you are a burden and problem whether or not you really are. Maybe they are well-meaning and maybe not. Regardless, you can only control just so much about yourself and performance.

Go ahead and spill here as many of your overwhelmed feelings as you want.