so, now I have read it like 3 times and it seems that this story is purely just a little short for a small slice of life animation.Just Sweetie Belle struggling to confess her little secrets to somebody else. I admit that it´s pretty normal to have fears of revealing your personal stuff when you are around the preteen years. 

So, you seem to mock your own content and honestly, save the technical mistakes that the BO would point out better than me, I don´t think there´s anything inherently wrong with it. It´s a little story, not one that serves for a mindless shitpost nor one that makes the cut for making it a highlight. 

In just one hour, well, that´s pretty productive that you wanted to type a mundane dialog and well, you have made the drawing for yourself, at least, you beat all the other fics because of that in that aspect.

Now, you make it sound like it´s underwhelming and if we get a little bit demanding, things could have gone with a more developed path:

why does Sweetie Belle get that worried about having white fur? Yeah, blue is boring for her but, is that the only reason? does she want to keep herself white because of imagery in front of the gallery?

Also, how are her parents color blinded? How does Rarity sleep at nights and face her visual problems while creating the dresses she´s ordered to make? These questions are what confuse me the most even though they try to justify the purpose of this fic.

As for more random things to comment about in a funny way:
> Sweetie Belle almost seemed a little annoyed.
> "Lyra is just cyan, which is a bastardization of blue and green. 
WOW, Sweetie Belle, the board owner is going to have a few words with you. Watch out your mouth if you don´t want to get banned over here.
> Trixie is dumber than even me, and Luna is just sad. Pretty, but sad..."
shitting on these blue ponies that are charming as hell...Sweetie, have you checked your taste at ponies? I don´t think you have the best one out of the bunch.  

> "No, I'm literally blue as the sky." 
Mrs Sweetie Belle, please tell us why you had to hide away for so long. We don´t know why you went wrong. 

> It'll be awhile till my fur goes back to being blue and it'll be just ugly for few weeks."
so you are implying that you are going through the molt that all the dragons do in their own way.I highly doubt it gets as annoying as that.

As for the characterization, I don´t see what´s OOC, definitely not the Apple Family. The southern tone that comes from AJ and the cautiously optimistic attitude from Apple Bloom are on point. 

So if I had to point out what I find underwhelming in it, it would be the rushed concept or explanation behind that lacks a little bit of development (even though I have to take into account that this was written in a very short period of time). The situation by itself seems plausible but I seem to remain in the same position as AB did.