What to do when being charged with shoplifting?

A few weeks ago, when I was shopping with a friend she got caught for shoplifting. I didn’t do it but since I was with her I’m getting charged, she’s underage and not getting charged. I have a fine for six hundred dollars, and can’t afford to pay it. What should I do? I have no criminal record, and have never stolen? Is this charge going to show up on my criminal record. It has to be payed Iin two weeks, and at the moment I can’t afford rent.