Shatter. That doesn't mean bulletproof

Ha. So you're bulletproof huh? Nothing can break you? Nothing can hurt you?
That's what I said before someone pierced my armor.
Like a window. Just...shattered.
I was like you. Confidence was brighter than the sun in my eyes, showing off their color.
However, pain found it's way in me.
Yeah it wasn't fun. Lack of heart. Lack of care in the world.
Yet, I stand alive. I'm not bulletproof. Not in the heart. Yet I've been careful. Indeed I have.
So don't ever forget that you aren't bulletproof. But believe you can be thick enough. I won't tell you ways to live. Yet I do hope you realize life very rarely gives a second chance.