That was a very interesting read. While I don't think children need to give their parents active reasons to love them or to justify their existence in that way, I definitely understand where that view's coming from. It seems that you were simply attuned to such different worlds that indeed, meeting in the middle became impossible. Such a good way to phrase that.
But that's solely with him. With your Dad. No one is unlovable period. Unlovable to all. :) I don't think so, at least.