This question is not about syntactical correctness. I do not care about that. The only thing I care about is to be understood properly. That's why I'm asking it here and not ELL.
The meaning of sentence is "If you don't love yourself, you can love no one" or "To love someone else you should love yourself at first". So, does the given sentence associate with these sentences in the minds of English-speaking people? Or is it too unnatural?
So, the question is how to write that. As in the title or as an alternatives in the body?