The best place to put this out there would be the shared housing/roommates section of Craig s Listhttp://www.craigslist.org
Most colleges have message boards where people list what they need - like roommates! Also - you might consider what your hobbies are and find a group or club on campus about it and then contact them and see if they have houses for rent for people from that group. That way you get to live with people who have your same interests.If you are a church going person you could also contact your church s branch/group near SF and see if they have a group of college kids going to the church.You will love college - it s a blast!-Patti
What college do you go? there are some dormitories for freshmen, the school will arrange your roommate.
Try craigslist