The simplicity of polite acknowledgement...
"I'm not invisible after all"... Means more than most will ever know.

I really love this write saffie... Into the favourites :)

The lines that poked me in the eyes...

"There is a person who's path I've crossed
although I doubt she has noticed me."

^^ Although your stating your opinion in these lines...
I see hopeful wrapped within, as you stated "crossed" path...
A cross is the symbol of faith...
So I read these lines as you hoped to see her again.

"I often wish I could make her see
how she brightens my heart inside.
But why would she even care
about the stranger passing by?"

^^ I believe an intriguing heart will always be left touched...
Maybe you have the same effect on her, but as you're strangers; her smile is a silent thank you??

"And everytime she looks at me
my heart releases tears
because as quickly as we say hello
it's followed with goodbye."

^^ these lines are very sad, as the hello turns on the light to brighten your day... Yet its short lived and turned off with goodbye.

Great write missy,

Keep smiling <3