I strongly believe in self-love, but many believe that it is narcissistic. Narcissism is defined as:

2. A psychological condition characterized by self-preoccupation, lack of empathy, and unconscious deficits in self-esteem.

For me, self-love is the ability to cultivate love within one's self. When people hear the word self, they normally only think of an individual, but I think that the ultimate goal of self-love is to expand our definition of self beyond the individual to include others. It's the only way we can truly embody the saying "Love thy neighbor as thyself".

A friend of mine brought up a great point that there is plenty of evidence of people loving their children, parents, etc without being able to say they love themselves. I agree, however, I don't believe that that kind of love is sustainable in the long-term. We either have to create with as much as we give out or plant ourselves in a community where we are sourcing love from others as we simultaneously give it.
At my old church in Los Angeles, we used to sing this simple song at the close each service. I hope it blesses you on your journey.

I love myself so much
So I can love you so much
So you can love you so much
So you can start loving me