A place to slip past

What I am is what I did,
or said I would, then did.

My word builds up a fortress of who I am.
"That's me,"
I say on a good day.
The to-do lists all crossed off
and promises kept,
piled as stones in a wall.
Let these deeds leave room for light to peek
through.
The thing of me I wish I was
and am.