I hate to say this but I think this is a song about depression and suicide.
We've always heard about people being "old souls", reincarnated many times and having much wisdom beyond their years. I think a "new soul" would be a fledging arriving on earth to find that all her attempts to find a place in life turn out a "mistake (mistake, mistake)". So she hears a voice saying "come and give me your hand - I'll take you far away" (from this strrange land, this pain of life). And she claims it's not sad way to go, "this is a happy end", going back to be reborn again.
Don't know if she intended this meaning, but it surely could be read this way, don't cha think? Hope no one takes her up on it.