Frizz depends on how you treat your hair, it can be frizzy at any length if it is damaged, dehydrated or brushed. Wavy hair often looks curlier as it lengthens die to the large pattern repeat.
Don't understand what you are worried about? Start caring for your hair like curly hair instead of straight hair (many of us follow the Curly Girl method), consider a curly specialist haircut (see salon reviews on the main NC site).
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics