My hair suddenly became wavy?

Your age has a lot to do with big changes. You've finished puberty -the biggest change of all. When me and my brothers turned 19 our hair went from light blonde to darker blonde. My brothers hair went from curly to straight but mine stayed the same. My nephew developed very curly hair at 13 when his voice started to change and it went straight at 21. You are leaving puberty and adolescence and moving onto adulthood. Your hair, skin and other body parts will change to their all grown up adult form and they won't change much until you reach your mid 30's . If you like the changes in your hair then no worries. Many changes at this time in your life are very good -acne clears up, your skin is no longer oily,  you no longer suffer mood swings from raging unbalanced hormones and more. So congratulations, you're an adult now, you made it through the toughest phase of life. 

nope it sounds like your complaining

that's normal my hair became less curly the longer it became and it was as i got older.

My hair has changed over the years, it was straight when I was very young, and then wavy curly when I got older, and now that I am past the point of caring, LOL, it is straight again

It's from all the times you've used a curling iron in the past

I do not know, I was born with super wavy full head of  dark brown hair and it is still very thick and wavy! Maybe it is the shampoo or conditioner?

Completely normal, hair tends to change a lot in life. My hair used to be stick straight and thin but now it's wavy and thick after puberty. 

pubic hair became wavy.?
very strange................
needs looking into 
oh yes