If he has high blood pressure, and you're afraid he'll have a heart attack, then that's his problem. If he finds out his son is gay because he's clueless, and has a heart attack, that's his problem. You are who you are. People look at other people like they planned themselves out. Like it was my choice that I have a big nose. Again, if he has a heart attack, then that's a problem he needs to deal with himself, you shouldn't be ashamed of who you are. Like nightprowler said, the longer you wait, the harder it'll be. The decision is obviously yours, you've heard my advice. Good luck.