"Worry about loving yourself, instead of loving the idea of other people loving you."
One of the most important things we can do in our lifetime is learn to love ourselves. It is so important because at the end of the day, it doesn't matter how many people say they love you or how special you are. If you don't believe in yourself and really like and love who you are, nothing anyone else says will matter. You still won't feel good about yourself. On the other side, it is important to first love yourself so that when you deal with rejection or criticism - and we ALL do at some point in our lives - you are better able to recover and accept that you are still of value regardless of what the outside world says.
Loving yourself is not selfish. It isn't a mentality that you are better than anyone. It is simply that you are happy with who you are and how you live. As great as it is to have people who like us and love us, we cannot rely on other people to make us feel good. They are not responsible for our self-worth or happiness. It comes from within us.