Got in an accident. Lied to insurance. Am I screwed?

[Anonymous]

So recently I got in a VERY minor accident when I rear ended someone at a student parking lot at about 1mph. I'm under 17 and had people in my car. When insurance called, they asked me if i had passengers and I said no. I also said that it is unclear whether the other person had rolled back (since this was on a ramp into a parking lot) and hit my car or I had collided with hers. Now they are contacting witnesses, and they contacted one of my friends who was in my car. Can he refuse to answer their questions? Can he say that he wasn't in my car? Do they have any valid proof that there were people in my car? Whats the best way to get out of this situation with the most damage control.