I don’t get sick very often. And no one in my family has ever had cancer, so when I was diagnosed with leukemia in January 2012, I didn’t even really know what it was.

But I believe we go through certain things so we can be there for other people. That’s why I’m sharing my story here now. Because I went through some pretty dark times during my leukemia treatment, and I wasn’t always sure I was going to make it. But with the help...