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So, the other day, I decided to start a fanfiction and went to work creating an OC, trying to fit her into the real storyline (I normally don't write about OCs, but it went with the fandom to add a new character). But she became real to me. So, I decided to make her the main character in a book I want to write.
I'm not totally sure about the plot, but I have her all figured out, and I've already written the prologue. It's in my notebook, though, and I haven't copied it to the computer yet, but when I do, I'll post it. But here is the character notes.

Alyssa 'Alyss' Wagner. 15. Super genius whore. Parents abused her.
Alyss was a normal girl...for a while. Till her parents lost Avery. Till they got divorced. Till Adam, her older brother, became the favorite. Till she managed straight As in honors class while Adam barely managed Cs in normal classes.
That's when the hitting started. They apologized afterward, at first. They didn't mean it. They were sorry. They'd never do it again. But then it became more and more frequent. The apologies stopped.
Adam knew, though. He helped her through it. He was there to hold her as she sobbed. That stopped, however, the day she kissed him. No. Then she became a freak.
She was alone, after that. Adam told their parents. They were disgusted by her. Adam barely spoke to her.
That's when Andrew entered her life. He gave her attention. He liked her kisses. He liked her. She wasn't a freak to him. So, she gave herself to him. Not long after, he left her. Moved onto the next girl.
She was only thirteen.
More and more boys came. Time after time, she fell in what she believed to be love. After a while, she realized, it wasn't love. But she kept doing it. She needed the attention. She couldn't be alone. She became the school whore before she was even fifteen.
Adam heard, and he told. Told their parents. Yet again, they were disgusted by their daughter. They kicked her out.

I'm sure it seems Mary-Sueish with her shitty past and whatnot, but she's not like, all peppy and cheerful and okay with all of it. She's bitter, she's a whore, she hates herself.
I think a song that really describes my vision of her is Again by Flyleaf. Yeah...I didn't plan that. I was listening to my iPod and that song came on as I was doodling Alyss, and I was like "OMG. YES! 8D" and started writing lyrics all around her. XD

But anyway, knowing what you know about the character, do you think you'd pick up the book? I know it really depends on the plot, but as I mentioned before, I haven't worked that out yet.
(It should be mentioned Alyss is sort of kind of based of MY image of all my friends, combined. I don't know everything about my friends, so I make things up with what I DO know, to figure out what they are the way they are, and combining them all in bits and pieces, with some orginality thrown in [the incest/abusive parents, the genius-thing, etc])

First off, the only way she's a Mary Sue is if she doesn't seem like a real person. If you flesh out her character, balance the good and bad traits, and can tell her story in a way that makes the reader truly care about what happens to her, then you'll be out of Sue territory. Right now it's too early to make the call on whether or not she's going to be a Sue, because it looks like you're still developing her.

But to reassure you, it sounds interesting. I like how there's a good cause and effect: she has trouble at home, which in turn causes her to sleep with all of these different guys, because she wants attention. It's a side a lot of people don't have with their OCs, so it's interesting.

That being said...

The above is an example of something that followed the cause and effect pretty well, but there are a few situations I think you could flesh out more (whether or not you already have the answers somewhere, I don't know, but still, I think considering these questions will help you out):

- Why is she not the favorite and her brother is? What does he do that makes him better in their eyes, or rather, what does Alyssa not do? Is this somehow linked to her grades?
- I'm assuming Avery is her sister. How was Avery treated before this? What did Alyssa think of Avery before she died? Why does her death trigger the parents to be abusive? Or is Alyssa simply taking Avery's place? How does Alyssa feel about Avery after the abuse starts?
- Were they divorced before or after the hitting (just because I don't really understand the order of events here. If they were divorced before, that obviously they don't abuse her together, so they probably have different behavior)? Once again, is this linked to her grades? What is the first trigger for the abuse to start? What type of abuse is it and why doesn't she get help?
- Does she consciously realize she's not in love, or is she optimistic that one day she will be? Or is she in denial and lying to herself? Or does she not actually care about love anymore, just physical love? Think about how her personality would affect her point of view on what she's doing.
- Every good story has one main, consistent conflict. What is Alyssa's? Is it trying to overcome the abuse, looking for real love, or something else?

I think what you have is a really good rough outline for a protagonist who can have a very interesting story. I hope the questions I provided will help you to flesh out your story more. Some might end up having the same answer, but I think if you can at least give a detailed answer to what I asked you'll have a pretty well fleshed out story. ^_^ Good luck!