Hi there ~
It is very likely that you are fertile or normal (in your own words) even if you have been operated on your testicle for a cyst
. It is highly unlikely that you are not. However to relieve your anxiety
you might want to get a semen analysis
. Please consult the nearest lab where they do that and see a doctor who can help you weed your way through the anxiety of feeling weather or not you are normal or fertile. I hope this helps.
Take care and have a lovely day!