MyMajors didn pick the major(s) I am thinking about. Should I forget them?
Not necessarily. As is also true of human advisors, MyMajors is not a perfect predictor of your ability to succeed in any field. It offers its best estimate, to a large degree, of your likelihood of success and enjoyment of a major. If you are convinced you know what your major should be, do that. Don’t rely solely on MyMajors.