Knowing that you are an admitted liar, your testimony in court will carry very little weight with me as a juror.
If I were testifying in a trial where you were a juror, and the defense asked me if I ever lied to a suspect I would answer yes. I would look at the jury while I was talking and explain the circumstances where someone wanted their property or money back more than they wanted to go to court. Jurors would understand that. Now, if the case had a mirandized confession, evidence or witness identification and you held out and got a hung jury the DA would refile the case. The other jurors would be pissed, at you, that you wasted their time.