MOST people who have a vericocele are NOT infertile, so while you should obviously expect more information from your doctors, it's not as grim as you're letting it become, in your head: https://www.medicalnewstoday.com/articles/323528.php
The best course of action for you right now is to get a sperm count. You will probably have to pay out-of-pocked for it, but peace of mind is worth something, right? If your sperm count is questionable, and you're concerned about the future, you could bank some of your sperm - again, peace of mind.
In all likelihood, you won't experience problems, but your best bet is to see a fertility specialist. They will know more about your condition and be able to give you advice for now - and the future.