Absolutely DO NOT thin out your hair! Thick hair is beautiful and healthy, your hair will get thinner as you get older and you will regert not loving it now. I would suggest, if you're bored with it, maybe some cute, long layers and angled around your face. More of a style will make it lay less poofy- you don't need to thin it- and NEVER use a razor cut on curly hair. It will make it more firzzy.
I wish my hair was as thick as it was when I was a teen! Be thankful for what you have....
Ouidad- Curl Quencher Poo/Dish, CHS Curl Keeper, Innersense Sweet Spirit and QCCC, Climate Control Gel, Tress F/X, Redken Fresh Curls Spray Gel