I never have this problem, honestly.
But I agree with WildChild. I visualize and play out fantasies in my head when I masturbate. Also, try out different toys. From what it sounded like you had a little bit better luck with a vibrator? I like one called Mr. Hal. It vibrates, has a rabbit and the tip swivels... so much fun haha. Reading erotica does it for me as well. I'm not much on porn but if I read something and visualize it myself it goes much further

Good luck! No girl should be stuck masturbation-less...