Who Am I?

[Marissacharles__]

I scribble this question again and again
in my diary, blunt pencil and a fistful of doubt,
hoping to find a mirror in a bed of words.

I long to be a signature, but morph into a sponge,
crouching in the shadows of others, 
for a drop of greatness.
Give me your metaphors that glow like comets,
lighting up an audience.
Throw me a word of praise I can wear like an epithet.

I am a castle of dreams, slave to failure,
a believer in ladders to zeniths from rock bottom.
Every so often, a broken rung scrapes against my skin,
sands the edges of a person still forming,
and the conundrum in my heart grows,
in search of a word, an adjective
for those growing blank spaces.

Perhaps, when I've collected enough words,
I would be everything.

Hey! I think a cute thing would be to have a metaphor after asking for one where right now you have a simile. "Give me your metaphors that are comets lighting up an audience from afar" is an idea! 
your final two lines are so so so powerful and I love your work choices like "Epithet' and "Zeniths" builds a lot of depth