Who am I?

I am a kid among adults
I am an elder among children
I am too old but also too young
I am limitless yet so restricted
I am perfect yet so flawed
I am a saint but a sinner
I am too keen, yet reluctant
I am taken but unclaimed
I am free yet a prisoner
I am in control of my life
I am a tool in the lives of others
I am loved yet detested
I am calm yet so, so afraid

I am a god among men, but
I am also a man among gods
I am my past
I am my future
I am one
I am all
I am I and I am you

I am who I choose to be
The question is
Who are you?