Well, I for one enjoyed it very much!!! Don't listen to authors who flame, 9 times out of ten they don't write themselves and are just having a cheap laugh over the internet! I think your ideas are really original, and Melody is so cute! Normally I don't really like OCs, but yours is adorable and has a real past, she's good to read! I think her and Harry make a lot of sense - they both have very similiar pasts and can relate to one another! Even though she's not suicidal, I can tell that cutting her arms isn't healthy, and maybe now that she has Harry to talk too, someone who can relate, she'll stop. And Harry hugging her, and not letting go was soooooooooo cute! Just don't let Hermione get her claws into him, I don't like her at all. She's so bossy and really rude!
I can't wait to see what happens next! Are you going to kill off any characters? Harry and Melody are neighbors right, maybe a summer romance? And was Lucius (Luscious, lol) the one who killed her mum?
Are you really only 13? Your writing style makes me think you might be a little bit older. Not calling you a liar, lol, just wondering!!!
Anyway, hope this helps.