Jesus' life was all second-hand info. He never penned a word. And so all that he said was more about interpretation of the authors than about actually quoting him. There is evidence that his words were tampered and changed to effect change in persons or societies, based on cultural traditions and norms of the day. Very enlightening, I think.
You gotta love yourself before you can love anyone else. Common sense. Else how would you know how to love? Maybe he said to love yourself, but nobody wrote that one down. Who knows. But if it's in your heart, and it's good, and you know you should do it, forget what the book says.