Lyric discussion by shikonaori 

Cover art for Lucky lyrics by Abandoned Pools

Anyway, this is my take:

"It's not me Find someone who loves you And if not me Find someone who knows who you are"

There's this girl who is completely taken by him. Though, he doesn't reciprocate, it's possible they're both strangers at the time. Maybe not even strangers - he just feels they don't know each other well enough. So he's telling her to find somebody else.

"They're just memories They can get so mean Little sacred things Floating out to sea"

"They're" might be everything she bases her love for him off of. Reasons, I guess. Though his reasoning is, "Oh, you just took them all the wrong way. You think they're really important, but look. There they go. Drifting away."

"I once knew a girl She once knew me We had our own world My life was free"

He's delving into his own past now.. this verse is self-explanatory, really.

"I loved someone I set them free They haven't yet come back to me But if they do I'll surely be More lucky than anyone could be"

Obviously it didn't work out with the girl he was remembering, but this is all recalling an old saying. "If you love something, set it free, if it comes back it's meant to be". Maybe it's a tad cynical..

"An empty house A sacrificial mouse A head full of lead Weighing all the things that she said"

Maybe they lived together at one point. Weighing all the things that she said, maybe he didn't do that when he was supposed to, back before they broke up.

"But I digress My tunnel vision Make me pay I know what I'm missing"

Looking back, he regrets not listening when he should have.

"So won't you please Find your way back to me My one and only Find your way back to me"

Self-explanatory.

"And if not me Find someone who loves you"

Basically, "If I can't have you anymore, be with someone who will at least treat you right." It makes you wonder if the girl in the beginning of the song is the same one he lost.