Careless personality shows that you are outgoing, cheerful and lively, which is a good potential. It shows from the side that your communication relationship is good. But if you are not good at words, you may be afraid to say the wrong thing. You can make up for this by looking at communication more, and it will be all right soon. As for poor physics and good math, it means that others should be similar. Therefore, you can consider giving full play to your advantages and applying for mathematics majors or normal schools in some colleges and universities.