Everyone hides their feelings every now and again, especially when we are feeling sad. Hiding or suppressing your emotions is not good for your mind and body.
A toxic behaviour is one that is harmful. I wrote about it HERE. Many people who exhibit toxic traits are oblivious to their own behaviours.
We all grow up in different situations. Some grow up in toxic environments, while others grow up in healthy situations. Regardless of your experience growing up, no matter how sweet or bitter, there comes a point in your life, when you will decide how you will respond to circumstances/challenges.