I think it is normal at your age. I'm 30 years older than you and it's normal at my age too. I don't think anyone really has a good sense of who they are. We're all just doing the best we can with what life throws at us. Who I am today is nothing like who I was 10 years ago, let alone at your age. Life shapes us as it goes. Just put one foot in front of the other and do the best you can. You will learn along the way.