First, don't wear briefs or anything else under your cycling shorts.

New (read modern) saddles don't really break in. It's your backside that does. You have to get through the sit bone soreness which should go away after the first handful of rides.

Your perineum (taint) should not hurt nor should you get numb in that area or in your privates. This means the saddle doesn't fit you or it needs to be moved and/or angled correctly. The shop should have helped you with this.

Saddle fit is very personal. Some people can ride any saddle and some need to try many different ones before finding comfort.

If you current shop isn't helping try another.