You need a girl with a big round ass....if thin girls are your thing then just find one with a booty...the booty gives you a bit of a buffer so you can fuck her hard without bottoming out.
My husband's got 10.5....and I can take it rough, all night, and we think it's due to my ghetto booty.
Besides that, just try positions that don't allow such deep penetration, like the one that's like missionary, but pull her legs together between yours instead of around you...she's get clit contact and her legs together will make you feel like you're nut deep, but you won't be that deep.