Kelly Clarkson - What Doesn't Kill You (Stronger) Lyrics Meaning

This speaks for everyone. A few months ago, on 5/5/12, I lost my very first guinea pig, Linny. The day of her death, I heard this song play on my radio, and then I just thought "Oh my god - this is Linny!". The reason I say this is because...

"You know the bed feels warmer, sleeping here alone. You know I dream in color, and do the things I want," tells me that although I loved Linny so much, she belonged where she is now. She is in a better place.
"Doesn't mean I'm lonely when I'm alone / Doesn't mean I'm over cause you're gone" says that although I am hurt by this experience, I'm not over like she is.
"Thanks to you I got a new thing started" is that Linny was my first guinea pig and there are many more to come after her.
"Thanks to you I'm not the broken hearted" means that there is someone out there like her that can help me, and Linny was just one who got me one step closer.
"Thanks to you I'm finally thinking 'bout me" means that I loved Linny a little too much and her death told me to focus on myself first, and then save the rest for the ones I love.
"What doesn't kill you makes you stronger" can go two ways. The first one is that Linny was sick often and she had a lot of stress in her life, but all that I think is what made her keep hanging on for so long at the end before she died. The second one is to me from her, saying that even though she's gone, I'm not, and I'm stronger because of that.

So all in all, really what this means is that as much as you think that tough times are hurting you like walking all over five thousand porcupines, they're really making you a better person.