How to decide your majors

Hi! I am going to be a senior in the fall and have a question for current college students. How did you guys decide your majors? Did you guys have to do a lot of research on different majors? Did you just have a better idea once you got into college?
I don’t have a very strong interest in a certain subject. I have tried career tests, but feel like they don’t really work. What can I do?

Thank you for your help!

This question has been asked many times on this forum (as a search shows). Each of the following threads (& there may be more) has answers.

http://talk.collegeconfidential.com/college-life/1800051-how-did-you-choose-your-major.html
http://talk.collegeconfidential.com/college-life/1556985-how-did-you-decide-your-major.html
http://talk.collegeconfidential.com/common-application/1172300-how-did-you-choose-your-major.html
http://talk.collegeconfidential.com/college-search-selection/929157-how-did-you-decide-your-major.html

thanks!