Lyric discussion by rachiedoubt 

Cover art for Solitaire lyrics by Marina and the Diamonds

Feels to me like a song about being very introverted and coming to terms with that. "I repair myself when you're not there" -- introverts often need alone time after social interaction or heavy stimulation to rebuild or recharge. I think the song is about realizing it's okay to want to be alone, to want to shy away from the limelight or whatever. Others may not be that way, and that's okay.