hey girls.. ermm i'm a guy with shoulder length hair (female tag for kopitiam purposes)
anyway i have naturally straight hair, very straight, and sometimes its really flat
short of perming it and tedious product + blow drying from below (?) is there any shampoos or whatever that can make my hair not so flat?

i'm not into dyeing hair, so i think i'll go with the shampoo
what brand of shampoo should i go with for the volumizing one?