the main character in a tragic story

you were born in a world of titans and ghouls. a killer you were back then, but after being captured by commander Smith, you became part of the survey corps.no one was able to believe you, the happy, cheerful, and bubbly girl was a murder.but later you were kidnapped and experimented on.what could happen?

I don't own attack on titan only the horrible plotted story.this might be my first long stories I made, I hope you all enjoy.

Edit:I'll have to do some errors on the story but. Not sure when since I am doing a few other books.please forgive for the errors