You were the only human of the Cullen family, at fourteen, and during your birthday, you got a papercut, and Jasper attacked you. Edward accidentally knocked you into a bunch of glass, and now Carlisle was picking out the glass with an expert hand and tweezers as he talked to you about choosing to be a doctor instead of drinking human blood.

"I knew who I wanted to be. I wanted to help people. It brings me happiness, even if I am damned regardless," Carlisle said gently as he picked the glass out and began getting a disinfectant.