I Am as Bright as a Bulb (sonnet)

I am as bright as a bulb that's lit up.
I am as strong as a beam made of steel.
I am as full as an overflowed cup.
I can decide what I will and won't feel.
I hold the keys to the depths of my soul.
I can decide who I choose to let in.
Why do I feel like I'll never be whole?
Why do I balk when it's time to begin?
I know I can face what I've faced before.
I made it through once, I can once again.
What makes me afraid to open the door?
What makes me so scared to even begin?
"No pain, no gain," that's what the experts say.
What box of shame will I unlock today?