Arrested on Juvenile Default Warrant that was issued 11 years ago!!!!!!!!!!!!!!!!!!!!?

Okay so here is the deal, back in 2000 I was 14 years old and did some pretty stupid childish stuff. I along with some friends took my friends mother's car without asking but returned it. Now, I am 24 years old. I am a Nurse, Mother of 2 and have never had anything on my adult record EVER! Tonight I was just leaving my house to take a walk to the store, I no more than took 10 steps and a cop pulls up beside me, and I need to mention I just got out of work and was still in my Nurses Uniform. Anyhow the cop says to me there's been a lot of breaking and entering's happening all over town and he needs to stop and check with people. The thing is he seen me walk out of my house which is confusing to me. So he asked my name and I gave it to him. I go about my business and when I come back from the store he pulls up to my house and arrested me on a ACTIVE default warrant for Unauthorized Use of A motor vehicle from when I was 14 years old. Now my question is how the hell is that even right?? What about Statute of Limitations? How long does a Juvenile warrant stay with you? I had no idea I even had a warrant all this time and the cops have taken my name before and checked me out and never told me about this. I find this very odd and am pretty livid. I need someone who knows the law to please explain this to me. Thank You soooooo much!