Not sure if I should feel sorry for your dad or for you or both of you.
Let me explain:
He missed so many great possibilities and chances to have fulfilled life. I have an 11 year old daughter and even learned how to sew through youtube vids, just to be able to show her. I go to KungFu lessons with her, make musik with her, teach her cooking, and to stand up for herself to be once able to live a fulfilled life... For me this was and still is one of the most challenging tasks I ever had.
In the end our children are everything and the only thing that remains from us. If we don't involve, nothing of us remains.
This is great! This is even more than I've ever wanted from my father.
I used to feel sorry for myself but I accepted my fate and forgave him for never being there.
There should be more dads like you and I hope there are. After all, you gave life and you should get involved in this life.
Lucky for me, I understood quite early what I could miss, not involving. Imagining how it would feel NOT to involve and realizing later what I had missed... turns my stomack and rips my heart apart, only by thinking about it.
Well, at least I had and still have a mother to do all these things for me.
The real challenge is for people who have neither a mother nor a father to get involved in their lives.