false accusations

Travis County has terrible record updating criminal database - risks overlooked dangers and false accusations (via Grits for Breakfast)

From an anonymous commenter (Revised for spelling, punctuation and all caps; comment since deleted):

I called the police on my boyfriend and said he hit me with a gun which never happened. I was mad and I wanted him to go to jail that day.

But now I feel bad for lying and I want to tell the truth but I don’t know what will happen since I lied to the police.

Please help me and tell me what I should do.