[ertyuio]

You can show them by demonstrating that your love for him is real, tangible, and that there's no doubt about whether he is truly the man you love, or if he's someone trying to make a false persona in order for you to fall for him.

Meet him. TRULY meet him. Have an actual face-to-face relationship. If you can demonstrate that your relationship is "real" and not just based on a functioning internet connection, then I don't see why your parents would object to anything. Until then, your parents have reason to doubt your relationship's integrity.