And now I realize I've only touched on a small part of the bigger picture. I've been mostly speaking from my personal perspective and recent experiences. I wasn’t even considering the points you brought up. So, I’ll say this…

I need to shift my perspective too. Why should I let these small, trivial issues affect me? Why are they living rent-free in my mind? I should focus on doing good, no matter how small it may be. Or as you said:

Make positive changes where you CAN

And your question:

are the negative feelings a wasted emotion?

Well, I’ve been trying to understand this, so I would say: Nope! They aren’t, as long as you learn something from them. I’ve learned that if I try to understand why these feelings are stemming from certain situations, and, if there’s a person involved, what the other person is feeling, I can be more empathetic toward them.

Because in such situations the negativity is bound to be a two-way traffic...