Same here, I feel like it's common on musician's forums to see people hating on their crappy jobs or lives, but I like my 9 to 5 and the rest of my life. There are other important things I could enjoy doing, but music is an entirely different world based on emotions that can't be quantified or analyzed (not exactly anyway). The challenge of making something that goes beyond normal reality (getting heady here) has a certain allure to it.
The thing is that, emotions are being quantified, analyzed, and studied. They wouldn't be able to do that if the former 2 weren't present. That's why we have psychology and the study of the brain. Chemistry helps study the atoms that eventually lead to psychology's study of emotions and the brain. My subjects may be off, but they're not off by much.
ex·is·ten·tial
ˌeɡzəˈsten(t)SH(ə)l/
adjective
of or relating to existence.
PHILOSOPHY
concerned with existence, especially human existence as viewed in the theories of existentialism.
LOGIC
(of a proposition) affirming or implying the existence of a thing.
It's not that the question is going beyond "normal reality", it's that it's understanding the purpose of what the hell you're doing with yourself.
If you actually haven't spent the time being introspective and mindful of yourself, then you're more than likely going to have to go through this whole "what am i doing here man?" sort of conversation with yourself. Depending on age, which i do have some experience to get through, you might be having to deal with it because you've never sat down with yourself for a long period of time to discuss these topics.
Now, you may not have to, but it makes things easier. Just contemplating on the fragile nature of humans helps you be more empathetic towards your fellow man. It also frees up a lot of your built up angst from over the years. It's humbling.
So then we basically changed the subject from purpose or not, to understanding the self.