As someone also on the younger side, I want to echo what you've said: I've also felt feelings of not belonging, things are hard, but you'll probably be fine.
More like the GP, however, I've gotten there not through identification with others but instead through the cultivation of a spiritual life philosophy.
Like GP, I also grow tired of hearing these voices too often. I have a little sister, who is 13 now, and she feels submitted to her fate. More often than not she feels like a candle in the wind (queue Elton John) instead of a captain at the helm.
But you're right, it is something to pay attention to. These little instances all add up to be statistically relevant and a source of knowledge for collective social truth-finding.
One thing I must insist on, philosophically, however, is that we are not often served by identifying with sub-par things. Personal identification is very useful for aspiring and evolving, but personal identification with the present or the past can unnecessarily keep you anchored to bad habits.