Demi Lovato wants to set the record straight ... when she's ready. The singer took to Twitter to tell the world directly -- that anyone speaking on her behalf -- giving interviews, selling stories to tabloids, whatever, doesn't know the real story and it's not their story to tell anyway!

Following an overdose in July when she was found unconscious in her home after a night of partying, Lovato spent three months in rehab getting clean and getting her mind together. And according to her, it's an ongoing process. She Tweeted Friday night: "I’m so blessed I get to take this time to be with family, relax, work on my mind, body and soul and come back when I’m ready. I have my fans to thank for that. I’m so grateful, truly. I love you guys so fucking much 💗 thank you "

But before all that, she told her fans and the world: "If I feel like the world needs to know something, I will tell them MYSELF. Otherwise people stop writing about my recovery, because it’s no one’s business but mine. I am sober and grateful to be alive and taking care of ME "

And she foreshadowed the day she'll talk about her overdose: "Someday I’ll tell the world what exactly happened, why it happened and what my life is like today.. but until I’m ready to share that with people please stop prying and making up shit that you know nothing about. I still need space and time to heal.."

We're not quite sure what reports she's so upset about -- her (former?) best friend backup dancer Dani Vitale has been slammed by Lovato fans since Demi's overdose, with those in the know saying she used to procure drugs for Demi. But Demi got pissed when fans suggested that's why Vitale was kicked out of the singer's inner circle -- instead, Demi said it was because, "True friends don't do interviews about you when you OD."

So is Lovato's latest round of Tweets still about Vitale? Apparently one day, she'll tell us!