Negativity from the people you cared for, intolerance in surroundings. ...do these things affect your compassionate heart and make you less caring?

No, not for me. I always care. I just learn to accept that some things are beyond my power to change. Instead of focusing on the negativity, I move on in pursuit of something more positive. Leaving friends behind doesn't mean I no longer care for them, it just means I still care for myself. So I try to make new friends.

I suppose sometimes I can be unfriendly, plus I have a temper, but such things are temporary. My nature is kind.

They don't make me less caring, but they do make me need more time for myself.

no, it can only be used as an excuse.

It just makes me cry and feel like I am a disappointment.

Hmmmm. Maybe in some ways.