There's a sweet girl
Who lives very far!
I can't define in words
How gorgeous you are!
If you notice, this stanza starts by saying there's a sweet girl, who lives very far... I can't define in words... <-- those lines are speaking to the reader. Then the following line, "how gorgeous you are!" can throw the reader off. Now with that last line, you are not speaking to the reader per se, you are speaking to the girl. I'm not sure how to explain it. The change fell abrupt.
I feel it may need a few more lines or an edit to make that line fit in that stanza.
Something like:
There's a sweet girl,
who lives very far,
I can't define in words
how gorgeous she is,
If ever wondered
that girl is you
^ this doesn't sound good, it loses the rhythm, However, I am just throwing something for the sake of giving an example. I'm sure you can come up with something better and that fits the poem.
The rest of the stanzas were good. I feel the love in the words.