OMG, I just went through this like 5 mths ago...I haven't spoken to my dad in like 22 years or something and I am only 26..so yea I understand everything you are feeling....When I finally talked to my dad for the first time 5 mths ago I didn't ask him anything like where was he for 22 years of my life, he just volunteered to feel me in on where he was and I completely understand stood why he didn't stick around, long story that I'm sure no one wants to hear but yea its a only natural you would be feeling this way...Are you angry with your dad for not being around (I know it sounds like a silly question) I mean I was angry with my dad for years and recently just came to a point that I wasn't angry anymore and that made it a little easier to talk to him. I mean if you try to talk to him in an angry way things may not go well. I think at first you should let him volunteer to say where hes been and then when you feel a little more at ease with him ask him the questions you want but don't over whelm him tho I mean this might be has hard on him as it is on you, it was on my dad! Anytime you need someone to talk to about this just PM me I here for ya