over a year ago:
"You wear your new tweed coat and
I’ve got my, miniskirt" - Pretty self explanitory. It's introducing the characters the song is about: 11 & Amy and that the song is in Amy's point of view.
"I didn’t know, didn’t know anything…
Oh I don't know, anything..." - Shows how Amy is often asking the Doctor questions about everything.
Under the dark light," - When Amy first saw the Doctor it was night time and she was a little girl.
"And I knew you, knew you
For all those years
Did it make a difference?" - Amy knew the doctor in her mind for many years after he left and was constantly thinking about him.
"Oh, and I remember your, smile...
I’ll remember you, for a while..." - The doctor smiled at her in the first episode when she first met him. Reinforces the idea that Amy knew him for a long time.
"Every time I see your, stupid face
Oh I, I swear I'll tell you" - This is assuming that the message in Series 6 episode 2 was meant for the doctor, Amy is saying that she'll tell the doctor that she loves him.
"But it's always about somebody else
You’re always thinking about, something else" - Hinting of the past with all the doctors other companions and his love for Rose. Also the flirting with River that occurs in series 6 episode 2. Also that the doctors mind is very busy and he's always working things out.
"Somewhere we’re having an adventure
And somewhere, I’m safe at home" - Brings across the idea that Amy's new home is in the TARDIS. She's having adventures with the Doctor but she's also home.
"And somehow you’ll, find me" - Refers to series 6 episode 7 when the Doctor says to flesh Amy that he'll find the real Amy no matter what.