If you think about it, you already use your interests to make decisions. Who to hang out with, what you do in your spare time, or what bands you listen to.
When you’re doing something you enjoy, it’s easier to pay attention and feel motivated. It’s the same when it comes to your career.
That doesn’t mean that because you like painting, you’ll one day be an artist. Instead, try to think about your interests in a wider way. They can help open up a whole set of jobs which might be right for you. Your love of painting could lead to lots of careers which involve creative thinking: product designer, comic-book artist, programmer, museum curator, advertiser or teacher.