Unfortunately, there is no way to delete your own questions at the moment. I found a similar question below and it seems like you will need to contact an admin in order to delete them. I am also asking internally if this can be done immediately. I will keep you updated.
In the future, I think deleting questions should be easier than what it is now hence I added a suggestion in the comment as well.
Once your questions are deleted, I believe your name should not be shown as well.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs