Can they put me in jail for something I lied about 2 years ago ?

I'm currently 18 years old, back then 2 years ago when i was 16 years old, I had made up a story about someone beating me up and then 1 month later after filing the report i sign a statement that i made it up. Somehow Today the courthouse call and told us we got court tommorow for the case of the beat up in which they told us back then they closed it. Can they put in jail for lying back then ? They still have the papers in which i signed & they witnessed it. Please help me & give me advice because I'm in my senior year of high school and i don't want anything keeping me from graduating and my family cannot afford an attorney. Please help us !!!