I majored in marketing for a few reasons:
1) I have always been a creative person and I was really interested in how businesses use creativity to grow their business and sell their products. My particular love for creativity was in advertising and how companies crafted their advertising messages and ideas. Though I didn't end up an advertising major, the idea behind the advertising messages is what got me interested in marketing.
2) I have always been fascinated by consumer behavior. Why do people purchase the things they do? What inspires people to purchase things in the way they purchase them? What things can be done to influence consumer purchase behaviors? Marketing is very much about knowing the consumer, how and why they buy things, and this fascination led me towards pursuing marketing (especially marketing research type classes).
3) I had multiple internships in college in different fields I was interested in: finance, marketing, sales. Ultimately, it was the marketing internship that made me the most excited to go to work each day.
I hope that helps provide some perspective, Eric!