The majority of students change their majors while they are in college-- so if you're thinking about changing yours, don't feel like you're doing something unusual or wrong.
When I first went to college, I was going to major in psychology. Then I took general psych. As many students know, general psychology is one of those "weed out" classes that's used to try to keep a popular major from becoming too overcrowded. The class is made intentionally difficult so that students are discouraged by their low grades and go major in something else. In my case, I actually got an A in general psych, but I weeded myself out anyways because I disscovered the major wasn't what I thought it was.
Then I took some history classes, since I liked that subject so much in high school. I liked them and became a history major. The next year, I started taking communication classes, and liked that so much that I became a double major.
My experience was pretty typical. After all, how can you know exactly what you're interested in when you just enter college and haven't even taken any courses? In my case, I knew nothing about the communication major when I started college, so of course I didn't choose that major right away.
The problem with changing majors occur when it causes you to stay in school longer. In my case, I changed early enough that I easily graduated on time. However, if you change your major after you've already taken a bunch of classes, you might add semesters or even years onto your time in college.
Is changing majors the right decision for you? Here's an article to help you decide if you should change your college major. Good luck with your decision!