Why is my hair dry and damaged?

Idk if it's from stress, or not enough water or something like dat. But I shampoo twice in the shower every morning with hot water. Nd I condition right after nd rinse wit cold. My hair is soft right after but once it's completely dry it starts to get rough nd frizzy again. Ohhh, nd I'm almost full samoan but my hair isn't nappy like troy polomalu. It's thin nd flat at first but it get's damaged a month after I cut it.