None of these main characters personified actual "Grunge"

That's not true. I was 25 and was well into grunge back in the early 90s. Grunge was the sound that GenXers like me were waiting for in the 80s but since the baby boomers controlled the music industry we had to wait. Remember generation X was the first generation to put off marriage until our late 20s. Being slackers we were not in a hurry.

I'm guessing you are very young. "found themselves and their places in life" is such an utterly conventional, rigid way of looking at things...not at all the way we thought about things then. You sound like someone we would have considered a loser, sorry to say--all nervous about Being Successful and Grown-up. Not that many people were like that. Well, no one cool or worth knowing. There always have been conservative Republicans...but fewer than now, who were young at least!

if these people are losers than I must be super loser

You only called it "grunge" ironically. It was something Time magazine declared--not a label young people ascribed to.

Yeah I remember that era fondly (23 in'92), and I recall that we never spoke of listening to "'Grunge Music'". That was something that parents might say. "Grunge" always seemed to be the clothing style where I lived, but even then, nobody cool ever really used that word much. 20+ years later I, now a parent, might be heard saying "Remember during the Grunge Era...?", but the word was always held at arms-length back then.