Wow, I'm sorry they're being like that. Parent should encourage their kids, and wavy hair is pretty normal. You're 17, so you should really be in control of how you wear your hair. Maybe you could show them pictures of celebrities and such with your hair type, so they can see that it's normal? Also, if you think it would help, have a calm talk with them.
Fine Texture, Normal Porosity, Normal Elasticity. Dyed to brown a few months ago.
Lowpoo: Trader Joe's TTT Shampoo
Rinse Out: Yes to Carrots, AOHR, Aubrey Organics Rosemary Peppermint
LI: Yes to Carrots
Stylers: Shea Moisture Curl Enhancing Smoothie, LA Looks Sports, Suave Professionals Captivating Curls Whipped Mousse