Would that juvenile record come up on background checks since I am over 18 and have not yet sealed my records?

I am 19 and I want apply for jobs around my town to make money to save for an expungement lawyer. I want to be able to pay them myself since I want to be responsible and that my parents have paid for all of my fines. My record as a minor haven't been sealed and if I ever get asked about my criminal record in job interviews, is it right to just honestly tell the employer that when I was 17, I was caught shoplifting a $30 item at a Walmart in California? I had to pay fines and do community service via Alternative Sentencing, have successfully completed every requirement and paid every fine. I want to be honest on the interview just in case if any of my juvenile record comes up. I've been incredibly sorry and definitely have learned my lesson. I have another question, after completing my alternate sentencing, paying everything, since it's been over a year and we've received no more things about my case, I think it is, does it mean it's closed? Was I even convicted of anything then? Is this a looked at as a misdemeanor or a juvenile adjudication? Is there a way I can just get my records sealed without a lawyer? How can I do it? Will this also show in my college applications or on loans? I've been problematic and panicky at what I should do, where to start and just really want to be sure. Thank you for any answers for my questions. I really appreciate them.