I can feel pain in your writing. I understand each emotion you expressed. There is truth in many of your sentiments. I want to touch on one thing, though...

If you're too humble, you get stepped over by others.

I think many people misunderstand humility. Humility is not putting yourself below others. It is not putting yourself down or thinking less of yourself. That's depression and weakness. Humility is confidence. Confidence that you are no worse than anyone else and that you are no better than anyone else. Humility is knowing that you are equal to everyone. That comes with what you said here:

Don't be the nicest person, be the fairest person.

To be fair to everyone is to be humble, in my opinion. When someone's reaction causes them to elevate themselves before you, you can choose to let them see that they are not better than you (telling the lady she is cutting the queue and therefore is acting as a nitwit). When others take advantage of you, you can remind them they are not better than you (relieving them of the benefit of your friendship). Humility is emotional intelligence. You don't get offended, you just get a realization that others see you differently than you see yourself and it is up to you whether you want to correct them, or let them live their lives in their own story.

Thanks for putting this into the world so I could read it and contemplate your words!