In this song, the main character, Buffy, a vampire slayer, had been brought back from the dead. But ever since she came back, she hasn't felt like normal, as if she doesn't fit in anymore, "nothing here is real, nothing here is right" Everything feels different. She just tries to go along, but she doesn't want her friends to know. "I've been making shows of trading blows, just hoping no one knows, that 've been going through the motions-"
Yeah, you most probably get it.
So, she pretends, going along, but isn't really feeling "I just wanna be, Alive"
She wants to live, and is trying, but something just no longer feels quite right. everything is hard, and harsh in the world of the living, and she just tries to fit in, though it isn't really working.
A sort of inside joke, is the bit "Nothing seems to penetrate my, heart" for those of you who don't get it, she stakes vamps through the heart. Yeah, it took a while before i spotted it.
Another thing about not noticing stuff, is in the scene where she frees a super handsome guy (with muscles and sixpack and all) who goes, "How can i repay" in a slightly suggestive way, and she brushes him off with a "whatever." Yo, people who love this, go check out the episode, it's called "Once more, with feeling" and is absolutely riddled with songs, and i believe they are all on here as well. :)