As far as structure goes yours is spot on here. I've seen many people who try to write rhyming stanzas and they will have lines that are too wordy, or have too many syllables which can break the flow of a piece. The same can happen with too few. I would change the 6th stanza to,
"I tried so hard to be her,
I tried being who I am.
Yet still I find myself alone,
And lonely as I stand.
I feel it flows better than splitting the second sentence between two lines.
Your skill at rhyme needs no analysis, I do however challenge you to try your hand at consonence. For example, "while I've grow old and weary knowing." Changing one word gives this line a recurring "w" sound that is pleasing to the ear and adds to the flow of the piece. You can also substitute the "old" with "wise" and achieve the same effect.
To the message? It is beautiful and you could not have done better. You are a talented storyteller yourself, and my only request is to try your hand at dialogue. No one tells a story better than the characters who are in it.