Your question is a little bit confusing to me. You said you blew your 21 day deadline. Does that mean you did not appear in court on the day your citation said you needed to appear?
If that's the case, then a bench warrant may have been placed. You may have lost a chance at having the bench officer (the judge) offer you a reduced fine. However, it is absolutely in your best interest right now, to go to the courthouse and appear in front of a judge. The longer you wait, the more the ticket will go up, and the more serious the consequences. You may need to make some phone calls to figure out what courthouse to go to. If you still have the citation, you need to go to the courthouse taht's checked off on it. You can go before 8:30am to talk to a clerk and get put on calendar; or you can hire an attorney and have them work on the case for you.
Either way, it's really important that you get to court ASAP.