Thank God someone else brought this up. I was afraid to use the words "curly hair" and "puberty" in the same sentence!
Anyhoos that's what happened to me. My father has thick wavy hair (so does my bro) and my Mom and I have curly hair (hers is more than mine) but as a child I had stick straight hair that resisted curling. Then when I was about 12 it began to wave and since I always blow dried it straight I didn't notice how curly my hair got until I was about 18 or 19 when I embraced my curls(though I still didn't know how to care for them). However I had really healthy hair when I used Biolage and the Conditioning balm and had my hair trimmed every 4-6 weeks. Now I can't find what my hair needs.