There are a number of things you can be doing to prepare for majoring in computer programming. Firstly, it is important to make sure that you have a strong foundation in mathematics. This will be important for understanding algorithms and other programming concepts. Secondly, it is a good idea to start learning a programming language. There are many to choose from, but some of the most popular ones are Java, Python, and C++. It can be helpful to take an introductory course in computer science to get a feel for what programming is all about. Finally, it is important to be active in the programming community. There are many online resources, such as forums and chatrooms, where you can ask questions and get help from other programmers.