It's not Shintaro this time, though it does remain The Score. This one fits Moon pretty well, I think, and the following is why! :)

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In my head I hear a million conversations: I headcanon that Moon's power (to enter one's head and elevate their fears, past experiences possibly lead to trauma) has driven her somewhat insane. She has lived with and for the Darks most of her life, and her power and what she's done with it has effected her mind. I headcanon that most of the time, she is in conflict with herself and her thoughts, almost always thinking about what she should or should not do. 

I'm paranoid that all my thoughts are all my friends I got: Moon doesn't really have friends, and she probably doesn't really want to get close to anyone anyway. She loves her sister, but she fears that if she gets too close to Ruby, Ruby's trust with disappear if Moon ever made a wrong choice. Since Moon is somewhat insane, she probably has voices in her head (just her talking to herself most of the time) that she can't really control. 

No sleep no rest: Another headcanon - that Moon doesn't really sleep well, due to her voices and just her constantly ticking mind. She does sleep, just probably not as well as the others. 

Am I insane?: Moon questions her sanity sometimes, when the voices in her head get loud or she makes the wrong choices. Most of the time she was fighting with the Darks, she was probably in conflict with herself - though she didn't know much at how to be good. (A/N: I can so see her using Zuko's quote: "Why am I SO BAD at being GOOD?!") 

All these thoughts I battle creeping up my skin: Moon battles against the voices in her head. Because she has a sister, and is now reunited with her (in Found), she wants to do as much good as she can. She wants to fight against the bad voices, the ones that tell her to do the things she would have done while she was working with the Darks. 

Fears they try to rattle who I am within, where do I begin: Moon fears that she won't be enough for Ruby. She fears that eventually, she will turn back to the bad voices, listen to them and go down that dark path again. She tries to fight against them, but they're what she's known her whole life. She doesn't know how. 

Burn em from within like fire: Moon wants to get rid of them. She wants to mentally set her mind on fire and watch the remains of her insanity burn away. She's aware that Linda could possibly help her, but she doesn't want Linda in her head. 

Run away, I'm going faster if I want to: Moon is running from her past, her mistakes, her wrong choices, the Darks, and the voices in her head. She wants desperately to get away from them, and she believes that joining the good side will help her with that. She wants to fight against what she's known for her whole life, but that is hard for her. 

Clench my teeth, I need to end this conversation: This line makes me imagine that Moon was talking to herself, but she wants her brain to basically just shut up. She wants to have her own thoughts, privately, separately. 

Strike a match cause now it's time to hit reset: This line is so perfect. Moon wishes she had a reset button for her whole life. She wants to reset everything, make it picture perfect. She wants to erase her past mistakes and earn Ruby's trust again. 

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There's probably going to be more Shintaro and The Score coming. I tried to think of who this song would suit when my sister showed this to me, but the first time, I couldn't really.

Now I know who - MOON! :D