You might try to organize books by genre, sort them alphabetically, or try any other means of sorting like color, weight, etc. Option to become a librarian include k-12 school librarian, public librarian, law librarian, university librarian, digital librarian and branch management. Knowing this in advance can help determine what undergraduate degree and/or master’s degree to pursue further down the line. A Master’s in Library and Information Science (MLIS), also known as MLS, is a popular choice for aspiring librarians. Hope you will achieve this goal.
One thing you might do now while you're still in high school is to see if you can either work or volunteer in a library near you. Often high school students are hired as "pages" who help to reshelf returned books or direct library patrons to the shelf they are looking for to find the kind of books they want. While you are working or volunteering you could see what the librarians do and ask them about their work.
Another possible job you might be able to get while in high school would be in a local book shop. People in book shops often really love books and are eager to share their knowledge with others. Working in a book shop does not require a specific degree but being an avid reader and a curious person seem important attributes to have.
Suzanne recommends the following next steps: