Can you ask questions about the changes? It sounds like what you really need is a critique partner: someone you can have a back-and-forth conversation with about changing your work in the direction you want.
I agree with everyone else too, especially the point `PinkyMcCoversong makes about holding off on submitting this anywhere for a while.
I'm just going to throw in that I agree with the above posters.
Also, if you're having this much trouble with proofreading feedback, maybe you should hold off a bit before putting this out. Get some critiques, revise, and then try and either ebook publish or submit to agents/editors. I feel like if you're this new, you should take your time to perfect your craft.
Well, I asked for a proofread mainly. Grammar and spelling as those are my weak points. But I feel the changes made have altered the tone of the character and the story a bit. It's little sentences here and there but kind of bugs me the more I read it. It's written in the style of journal, so that's probably the main issue I have with the tone. I don't know if it's the proofread job or if I just suck at writing and now with it cleaned up I see how bad I really am.
If it's grammatical and spelling errors that were fixed up and changed, I'd personally keep them. Grammar and spelling are extremely important and if you plan on or are getting this story published, you want it as polished as it can get.