My name isXXXXX have been a licensed attorney for over ten years and will be assisting you today.
The history of the Youthful Offender Act is a murky and conflicting one. It is clear that "setting aside" a conviction is not an expungement
, and most of the legal analysis done on the subject considers it like a pardon.
The little law on the subject does seem to say that for purposes of owning a firearm, voting, and sitting on a jury, a conviction set aside under the Youthful Offender Act does not count against you. You wouldn't be in trouble for answering the way you did because it is confusing even to most judges, but you ought to contact the court and ask to change your jury form submission to "no" on the felony disqualification.
Some more reading on the subject particular to your situation can be found in this article on the Youthful Offender Act starting on page 510 and 511
If you have more questions please feel free to ask. I'll be happy to answer them. If you do not, please do remember to rate my service in assistance to you today.