Oh, Hun.... Even when teenagers/children/humans make a few mistakes, they should never have to endure someone hitting them.

As for feeling lost, you might be experiencing some grade A parentification. (See here: Family Boundaries and the Parentified Child - Mental Help Net) Parentified children often feel at a loss as to who they are beyond the role of caring for others, since they missed out on a normal childhood and grew up too quickly.

I hope that helps. Coming from someone who raised her younger siblings, I definitely have felt lost and like I'm missing pieces to myself.