Start With loving yourself, then love Your Family, then love everybody else, hate noone.
Love started when our parents especially our mother see us first when we were born. Like what you said, we cannotnlove someone if we do not love ourself first. If we love ourself first thrn we can give it to others. But first of all, we have to love God first then the people important to us.
Without love we'd probably be a bunch of mindless barbarians who doesn't really care about anything. Love brings about all good things in this life and it makes life worth living. There's no question about it's existence