Victoria Yan Pillitteri
First, congratulations on graduating high school! It's great that you are considering continuing your education in a technical field where women are underrepresented! Earning an undergraduate degree in software engineering (or computer science) means you'll be learning about computers and computational systems, their theory, design, development and application. You will take classes in learning programming logic, different programming languages, algorithms, computer networks and security, computer system architecture, operating systems, database design, etc. There are many different areas you can choose to focus in once you know where your interests are.
Engineering is as much about having a good work ethic and dedication to your studies as it is about applying science and math to the real world. Don't doubt your abilities until you try them out! If you are interested in arts and music, I suggest either minoring in those areas or joining clubs and other activities so you can still have a diverse educational experience and pursue all of your interests. It's very common for students to change their major, so there is no need to worry!