Did you have trouble picking a certain area to start studing as a major and if so what was the deciding factor for you?

Yes, I had some trouble because I'm interested in a lot of different subjects and didn't really have a plan for what I wanted to do once I graduated. While I was trying to decide, I took a lot of classes in topics I was interested in that counted for multiple requirements I needed to graduate - an example would be, if I thought I was interested in sociology but also needed to take a language course to graduate, I might take a Spanish course that focuses heavily on Spanish or Latin American culture, or other topics that tie into sociology. Or, if I thought my major would be in the humanities but I knew I'd have to take a science class eventually, I might take a science class with a heavy writing component, so I could make sure I was okay with writing that much while also fulfilling the science requirement.
I ended up being a psychology major, but I didn't think about what it would mean for my career - my current job doesn't directly relate to my degree. If I was doing it over again, I'd think a little more about what I wanted my life to look like after graduation and have that play a bigger role in my choice.
Here's an article you might also find helpful: https://www.livecareer.com/quintessential/choosing-major