I was so afraid of telling my dad, too. I was expecting the worst from both my parents. But my dad and I had a very awkward man-to-man chat in the car one day, and he told me that he just wants to me to be happy, and he's just glad that I trusted them enough to tell them instead of hurting myself.
Congrats on being out, man! Feels amazing, right? As soon as I told my parents, I just felt relieved for the rest of the day, knowing that from now on, I don't have to hide or pretend.