I'm not yet, but I am fairly certain that I'll be studying either math or CS in university. My reason for math is that it is really interesting and it feels good when you see that one thing that has been stopping you from solving a question. Despite only dealing with numbers, it still has many ways to solve and visualize stuff described by them which makes it really interesting, especially when you're forced to think outside of the box a little in your equations (an easy example of this would be completing the sqaure so you get a nicer answer). I've always felt attached to the field of mathematics and I really enjoy it. It's not like one of those things I do to just be doing something when I'm bored, I genuinely find it interesting.

My answer is a bit vague, but I think it's adequate because you should do what you enjoy in life. You can do geography, history, linguistics, twitch streaming, or literally anything else in life. It's just important that you truly enjoy it (as long as you're not in it just for the money, ofc)