Engineering usually has some prerequisite courses that you have to get through. If you want to change majors you should talk to someone, a counselor possibly, and make sure you are taking the required courses to get into that school/major. Probably some mather courses, and a required minimum GPA. College students frequenly change majors, so it shouldn’t be a problem, except, depending on your school, and how crowded the engineering department is, it might have limited space.