@Siikalahna: His knowledge from past life is exactly what led him to this.
He was the loner solo assassin type who worked fine (well, until whatever got him killed last time)
But now he's a (physically) weak little girl without the full might of his past life, meaning situations that used to be 'fine' for him to handle are no longer true.
Yet despite that his thinking is still the same so he keep getting into trouble beyond what he can handle. (or maybe that's just in his nature, sticking his neck into trouble solo regardless of his own strength?)