Are you a hair twirler at all? What is your diet like? Do you take vitamins? Have you been to a dermatologist? Do you use a lot of protein? Do you deep condition a lot?

There's many factors that can cause this. I don't really buy into the products that supposedly grow your hair faster. This comes with proper nutrition and good health of the hair. And time.
2c-3a - coarse - normal-high porosity - high density - growing out to donate

NP/LP: KMF Whenever Conditioner/ YTCucs
RO/LI: Sevi Pumpkin Seed DC / CJ Argan & Olive Oil, KCKT, YTBbs
DT: Coconut Oil + scalp massage
OIL/STYLER: SM Elixir / KCCC
COLOR: henna, amla & indigo