the silent one in the back

What is the definition of life
Are we all the same on the inside
Are the monsters real
or is it just what I think
Being the silent one in the back
I appear as a creep
No one really knows
The things I see
The secrets I keep
The words in my mouth
that never came out
Is it all nothing
Or was it all worth something
that I never really became a part
of the rest of the living