It's great that you have met your stepsisters and get along...
I can understand that it would probably be easier in some ways to have an absent parent than the to and fro of access arrangements and the hassle and arguments that often accompany it - less upheaval in your life...and you still have a father and see him from time to time...
It is no doubt harder when the father is unknown - leading to identity issues...
It's interesting that many people born as a result of donor sperm are now trying to trace their biological fathers - it seems we all need to know our heritage, our biological family - even if he's not the man who got up to you in the middle of the night...
