Three mistakes, you say?
Hey guys, I'm writing a story. Unfortunately, I can't spell for shit, considering I'm still in a freshman in high school, and never paid much attention through middle school. So dose anyone want to proof read it for me? Fix spelling, and grammatical errors. Please, and thank you. Peace out, homies!
I've bolded three issues: Plainly incorrect structure (it looks like you were trying to phrase it two different ways); The misspelling of "does"; and the last two aren't actual sentences (but that doesn't much in this environment).
My point in this is not to ridicule you so much as it is to point out that mistakes are common. Do you proof read your own writing? I think that, if you did, you would have caught the "dose", and likely the first mistake.
First of all, use something with a spell-checker. This will fix any mistakes in spelling, and help you learn to spell words you have trouble with.
Secondly, proof read your own work. You'll find most major grammatical errors this way. You'll also notice phrases where it just sounds odd, or is difficult to read clearly, which are just as bad.
Not until the third "step" should you get someone else to (proof-)read your work. Nobody wants to read through a piece so terribly riddled with errors that it's difficult to get through. If you correct the biggest issues, someone might be willing to read it.
To quote you, "I just need an editor." Editors are paid to do their work for a reason. It's a valuable job, and it's not something that most people who have the required skills will volunteer to do.
Plus, proof-reading your own work will let you review it, and make sure it's what you want. If you aren't doing this, you'll have some serious issues writing a story of any significant length.