Hi Kristina, I assume you're asking about majoring in college! If that's the case, don't worry about it quite yet, unless you are planning on attending a college outside of the United States. Barring that, the standard for most colleges is you declare at the end of your sophomore year, allowing you nearly four full semesters to explore your interests before settling on a choice. Of course, it's a bit more nuanced than that. Sometimes, by choosing a college, you have already "declared" an area of study, even if you have not necessarily declared a specific major. For example, if you go to a tech or engineering school, more likely than not you will major in a tech-related field. That being said, with some exceptions, generally you can still major in non-technical fields even if you go to a tech college, and the general rule of formally declaring at the end of your sophomore year still applies. Sorry for the longish response to your answer. I hope it helped and best of luck!