An analogy of growing up...

It's like... Lyra Belacqua, from The Golden Compass storybook, forcefully abandoning herself from her daemon (soul) while having to enter the Underworld.

It is necessary, it is painful, and it is most definitely heart-wrenching. You don't want to do it at all, because it's alien.

But once the teeth-gritting process is over, you either become an empty shell, to join your fellow compatriots as a machine; or you become a much better person, with more flexibility and knowledge.

With these grim words, I encourage you to listen to the song. It features a Metal/Rock band performing a very soft Rock song, with deep lyrical meaning and a nice, soothing tune to go with it.