Not someone you know

The main character was overreacting to everything. She's way too clumsy and she's annoying. One Problem i like to state is that, how does one person differ so much from their younger self? In the Past she knew that her hair would get frizzy if she doesn't tend to it, when she was an adult, why doesnt she know that when shes an adult? And when will a director make it okay for the First female lead to be in a relationship with the second male lead? And for the first male lead to be with the second female lead? Although the actress acting was spectacular, Her character was annoying.