If you have a confessor, and he’s told you not to confess there must be a reason. You should obey his prescription. If you fall into new mortal sin before then, call him at the office.
If you are not under a prohibition to not go to confession, you can seek an unknown priest.
You mention you are new to Catholicism. Are you in RCIA? If you have been told that you are to make your first confession at Christmas, it would be incredibly wrong to disobey. Confession is for Catholics only…and it is up to your RCIA directors, and the priest, to determine when this should occur.