BEING TOO POSITIVE IS UNHEALTHY
Being positive is good but when you're fond of covering up your emotions to appear positive, that is toxic.
FOR EXAMPLE
There are people who are addicted to hiding their problems. They mask and bottle up their emotions. The person can be smiling, happy, but facing big problems within. Sometimes it leads to aggression. They end up transferring aggression to anyone they come across.
Pushing yourself into thinking positive even in damaging and unfavourable situation just to overlook the reality of the situation, is toxic positivity.
Emotions like fear, anxiety, pain, heartbreak, are normal and part of being human. There is nothing wrong in expressing yourself. Expressing yourself is not a sign of weakness. Anyone that scolds you for expressing your emotion, is an enemy to your méntal health.
FURTHERMORE
Religious people are also fond of this. Someone can be sick, instead of directing the person to the hospital for proper check up, religious people will tell the person to pray and apply faith. If the person refuses, he/she is tagged an unbeliever. But they fail to realize even their top religious leaders have personal doctors. They also travel abroad for treatments.
Faith is necessary but know when to seek help outside faith because God won't do what you can do for yourself. God created the trees for man but he can't make furnitures for man.
Express fear in the midst of religious people, they will claim you don't have faith, you're too carnal.
Please stop masking your true feeling. Seek help when necessary. If you mask your feeling, it can lead to depression, aggression, sometimes suicide
FINALLY
Avoid people who passes judgement on you anytime you express your truth. Set healthy boundaries with them. They are enemies to your life and mental health.