I think an honest, heart to heart, “I love you so much, but I really need to spread my wings. Please don’t hold me back” conversation is your best bet. My poor mother (many years ago) had to settle for her only child being a 6 hour plane flight away on the opposite coast, making just one phone call a week, and not coming home for Thanksgiving. Yet it was good for both of us, and I really did need to get away. She understood and didn’t want to stifle my independence. Let’s hope your parents see it the same way.