For example when Winn confronted her about her having panic attacks she said something to the effect of “those are silly human issues and i’m better than that” to which she did the same thing in the premiere when trying to distant herself from her feelings.

She said in the past episode about being Supergirl—“I can I feel strong, even though a huge part of me feels so weak.”

The comments about being broken being a human thing (even though Kryptonians obviously had the same range of emotion that humans do) is actually her rejecting a part of herself, not humanity. 

This isn’t a character trait previously seen, but something she’s recently using to try to protect herself.

Kara does have a degree of ego—a healthy level of moral superiority, an ‘I can handle anything’ attitude, and some Kryptonian pride—but it has never before presented itself as judgement of humans. She has only ever been shown to love humanity. To love emotion.

In fact “Stronger together” is a Kryptonian motto,

“Back on Krypton, no one was their own man. Growing up, I was taught that to accept help from people is not a shame, it’s an honor.”

But she’s rejecting that too, saying she’s above help despite Krypton’s culture emphasizing that help is a good thing, even more so than for humanity.

But that means opening herself up to people and thus opening herself up to more pain, and since Kara Danvers represents her want for a happy life, a “normal life,” (and thus, on Earth, a ‘human’ life) she’s conflating that human identity with humanity in general.

It’s not really alien vs human, it’s ‘the girl who is destined to save the world and lose everyone’ vs ‘the girl who wants a normal life and loves her earth family’.

And focusing on ‘the girl who is destined to save the world’ aspect of her current worldview is a lot easier than ‘the girl who is destined to lose everyone,’ and what results is a certain degree of superiority that is more a show than how she really feels.

It’s sort of like seeing Kara on Red K (which was a depression allegory to compare to this straightforward depression storyline) and saying “wait she is Supergirl because she thinks National City should bow to her?”

There is a piece of her that probably likes the power, but it’s likely at the same level as anyone else would, and something she would try not to dwell on under normal circumstances.

To compare, as an audience, when Mon-El says to Kara, 

“You fly around, rescuing people, like you’re just pure of heart. But that is crap. Because you love that attention. You love people loving you. You are not selfless.” 

we’re meant to go, “He doesn’t get it. Sure the attention is nice and all, but that’s not the point.”

Kara would still try to help people without any attention, would still try to help people if she utterly hated herself, because ego is not the actual reason she does it.

And if there’s an element to her superheroing that isn’t just a straightforward want to help, it’s that she feels as if she has to be this person because she thinks her mother sent her to earth to do so. She feels responsible. This has been something demonstrated consistently throughout the seasons.

And there’s pride in accomplished responsibility, but the feeling of responsibility is in and of itself the more prevalent motivator.

But really? Knowing Kara—knowing that even as a child, before Krypton’s destruction, her mother always said she had the heart of a hero—she would still be trying to help people without these other motivators.