Be glad you got to spend as much time with your dad as you did.
My dad got a stroke alone at the house while I was off to college and my mother was at work. Today he can't do much on his own... his consciousness (or that which I grew up with) is gone. All the things I wanted including teaching me home improvement/maintanance, surviving and thriving in my career, and all those other important aspects were instantly stripped away from me. Somehow I live on, always remembering the importance of everything he taught me. Just wish I had more time....
That said... (and this applies to everyone). Be REALLY fucking happy you get to spend the time you do. I didn't even get to make it into the transition of adulthood with my father... which is probably one of the most crucial things in life. Cherish every second.