how is this possible?
Our sense of taste is highly connected to our sense of smell. If you think about the last time you had a cold and stuffy nose, you might remember that your food just didn't taste as it usually does. Therefore one reason that our sense of taste varies is that people have different abilities to smell odors.
Also, the tongue has specific areas that are sensitive to the basic flavors, and scientists have even discovered that there are taste buds that go beyond the basic sweet, salt, sour, and bitter. The distribution and abundance of these nerve endings, along with how you chew and swallow, might also contribute to diversity in how the sense of taste is perceived.