Destroyer of Great Things.

Welcome! Anyway, I commend you for your effort, and thank you for not attempting a rhyming poem as many writers do. My critique may be harsh, but it shall help. I assure you it will. I put my changes in bold.

Here I am.
What do you want?
I'm telling you not to,
But you don't care.

I don't really like it as it doesn't hold much feeling and seems like you are just tossig around words instead of giving them meaning.

You're starting to get stupid.
You don't need this anymore.
Give is a rest;
Stop questioning your own motives.

The last line didn't flow and stupid is not a descriptive enough word. Put emotion and feeling into this.

If you need help,
You know where to find it.
But if you want to stay in your bubble,
(No Please here--it doesn't flow) By all means, sit there and rot.

That stanza was a little better.

Wait, what was that?
You do need help?
It's too late.
You’ve screwed me over too many times.

You just contradicted yourself. The last stanza you said that if the person needs help, they know where to find it. They you say it's too late. It doesn't work. And the term screwed me over is not the right thing here. A writer can expand their vocabulary and make someone feel the pain, not just read the words.

Get out of my life and stay there.
I don't need you to saturate me with your feeble lies anymore.
I hope you like feeling alone,
Cause I was all you had.

I like the word saturate, but not the word feeble. I don't think it fits. Also, I would change that last line to, "Because I was all you've ever had." I think it flows better.

You're destroying only (word switch) yourself.
(watch your tenses) I'm not getting hurt by this.
Now go and think about that,
You destroyer of great things.

I don't think your last like was strong enough. No, scratch that, I don't think the poem was strong. I think you had an idea with potential, but you are tellling us things, not showing them to us. Made us see your rage and feel your anger. That is what a poet, what a writer does. It was a good try. It could improve greatly. PM me when you revise it and I'll help you work on it.

Regards,
Nicole