How do I stop my hair from kinking out when it sits on my shoulers?

So I always dry my hair after i wash it. I blow dry it and curl it under with a styling brush. But after at least an hour its there kicking outwards!

I don't use any products on my hair apart from shampoo & conditioner obviously, I'm not aloud straighteners and I want to know how to get my hair to be straight at the ends again!

I have a side parting, |-.---| < imagine thats the birds eye view of my head, thats where my parting is, the hair on the left of my head curls inwards, thats great! how i want it. But the hair on my right side kicks out! I know its because theres more hair on the right side weighing it down so it kicks out, and the natural oils of my hair dont go down as far to the ends so it wont style naturally (as my hair is naturally straight).

But is there a solution for this everyday crisis!?