Quite Certain

One thing is for certain...
I'm intelligent, stupid,
Exciting, a bore.
Confident, unsteady
that's not all, there's more...
I'm driven and lazy.
Consistent, erratic.
I'm stable, a head case
mellow, dramatic.
I'm young and I'm old.
I'm wild and prude.
I'm peaceful, I'm angry.
Sometimes kind, sometimes rude.
Mysterious, obvious,
joyful and sad.
I'm dependable, flaky,
half angelic, half bad.
I'm tender. I'm harsh.
A loud mouth, a clam.
I'm certainly uncertain of who I am!