I struggle with social anxiety. It certainly effects my day to day life. As a person who enjoys drugs, I have found, through self experimentation, that it's usually best to accept the feeling of anxiety; acknowledge the feeling, understand it, and embrace it. This is the only way I have grown through some of my social anxiety. And this is not to say that mindfulness rids me of anxiety, or any other unpleasant emotional phenomena, only that it is the only way I have truly worked myself through tough situations.
There are situations I simply would not have made it through, or would have participated in at all, without some sort of medication. These situations effect me to this day.
As for opiates, I would say it is EXTREMELY unwise to consider using them as an anxiety med.. especially for people that deal with anxiety as seemingly constantly as I. That said, I find opiates enjoyable, and have experimented with them a lot, but they are for sure not a class of chemical I feel an affinity towards like I have heard described on this site.
Drugs are fun, drugs can help, drugs can hurt, and drugs are scary...
Inform yourself, as much as possible, and seek the help of a professional, for your social anxiety problems. Most importantly, look into yourself. You can be your biggest help with these issues, even if the only help you receive is understanding.