What is successful? Money? Social status? Love?
True success beyond the tangible and superficial realms of this world lies within. It is that satisfaction that one's own path is truly fulfilling the measure of their being. You can be happy living off of $8 an hour as long as you live within your means. You can be happy by extending charity, love and understanding to those within your social circles rather than striving toward higher classes. You can be happy even in times of lost love if you exercise that seed of faith that one is out there for you and that you will eventually find that person.
In short, if your life is filling the measure of your spirit and being then yes, you are happy!