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.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.