<p>Adding to @compmom, I would say that it’s also important to learn in fields that challenge you and give you skills (so not just what interests you).</p>
<p>Most people have multiple interests, after all.</p>
<p>So say that you are equally interested in philosophy, economics, and sociology.</p>
<p>Knowing economics will benefit you in our economy and give you knowledge that many companies value.</p>
<p>Philosophy will sharpen your mind. Anyone who gets through a good philosophy program will have good logic skills and be able to read dense texts and make convincing arguments. Sociology, I’m not so sure of the benefits there.</p>
<p>I do feel sad when I hear of folks who, near the end of a major in psychology or a field like that, realize that they’re not really all that interested in the field after all and don’t want to do stuff related to that field. Majors that give you skills at least leave you better off even if your interests change.</p>