Lithium
Of course I know what Cobain meant, I was saying what I personally heard.
About A Girl
The song got it's name when Cobain was asked what it's name was and he replied something like "I don't know, it's about a girl"
One of Kurt's first acoustic songs, this was written for Tracy Marander when she and Kurt lived together.
Heart Shaped Box
Sounds like he is trapped by a love that he would do anything for.
To me Lithium is saying that we are not perfect, but we are perfect for each other. It also seems like this love that Kurt speaks of was pushed away and that he had pushed her away.
Been A Son
*sister
Supposedly Kurt wrote this as his way of saying that he knows his father wishes his siter had been a son.
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