You only learn by the risks and chances you take, you only learn by living. Life was made so we could learn by making mistakes until we knew exactly how we should of lived life, and that is when we go to heaven.
I had to learn to not let people take so much of me that they left me empty. But I cared so much that I couldn't see it. I had to learn the hard way when I finally realized a close friend was using me for her own gain and giving nothing back. Give, care, but dont let others take you for granted or use you. Sometimes we have to put ourselves first for our own physical and mental health.