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College majors can be a big decision. There are a couple ways that I would suggest. I'll speak from my own personal experience and what I did wrong and right.
First is to consider what you liked in high school, such as chemistry or math. I enjoyed chemistry and could do the math and therefore chose to do Chemical Engineering. It's easier to decide when you know what you like.
Second is to consider what type of jobs a major can get you. Some are pretty obvious, such as finance, accounting, engineering, architecture, etc. With those professions, it is VERY important to know that you'll be happy with your future in those fields. For example, do you like the personality of people in the field? Do you like the companies that hire those people? Do you like the lifestyle, or the work/life balance?
I did like chemistry, could do the math for chemical engineering, but really didn't like the people I would work with and the type of work I would do. Therefore, Chemical Engineering wasn't the right major for me, though is very useful.
Also, consider the quality of life that a major and it's average or most likely profession affords. Everybody would love to be an artist, but making $25k a year isn't exactly much money. I'm fairly pragmatic with this, especially with respect on how GPA ties to salaries. Finance majors with a 3.9-4.0 can earn $70-$120k a year with consulting of investment banking, though the hours can be rough.
Hope this helps!