It's OK to be undeclared. A large percentage of incoming students have not yet declared their major. Take time to explore the possibilities. Meet with an adviser at the Advising Center and use SFSU services, like the Career Center, to help you find the right major. It's OK to change your major.
Most students change their major at least once while in college.
If you find that the major you have chosen is not right for you, explore other options. You will probably find that there are many more choices at SFSU than you have ever encountered at any previous school. General Education and major requirements may sometimes overlap. Most majors include courses which meet both GE and major requirements. Review your plan frequently and meet with an adviser on a regular basis.