Well I think you will be happy depending on your expectation.

It is true that you will not be happy if no one loves you, but I think we are sing love one sidedly

Despite our appearances, our attitude, our opinions there will always a person who loves us. No matter what we have friends that love us, we have our brothers, our sisters, our parents, relatives and many other person that surrounds us. Well if you are saying that they all not love you, still we have our God who loves us. If we can't be happy knowing that no one loves us, maybe our expectations was too high. We must be contented to those person who loves us and not depend our happiness to  single person who doesn't love us