I enjoy playing and doing things I love rather than studying. Of course, who doesn’t? But, according to John Stuart Mill, happiness can be defined as “the greatest degree of pleasure for the greatest number of people.” However, happiness understood as the greatest degree of pleasure also includes the least amount of pain.
In addition, Mill insisted that not all pleasures were identical in value and that some pleasures were more desirable than others (for example, the pleasures of learning and conversation). So, in order to be happy-and a good utilitarian-you should do things you enjoy, as well as study, since studying will prepare you to lead a way of life that will realize your potential as fully as possible. It may not always be "fun" to study, but if Mill is correct, then happiness and having fun are not the same!
Also, you should act in your own best interests, but you should do so by taking into account the best interests of other people as well. Remember that everyone wants to be happy; as a result, if people help other people, then that increases the total amount of happiness.