The idea of speaking openly about sex can cause great anxiety in any person bec it's a private subject filled with stereotypes, labels & preconceived ideas based on our own morals, values, religions & culture.
Talking about sex can be torture! Some view it as...well if you can openly speak so freely about it obviously you're promiscuous! See? Another label. Lol

Please remember if you look back briefly in our history that the sex conversation has only been around for a short while really. It hasn't fully evolved so you're not the only one with anxiety. Believe me.
Now you're also mixing into the conversation something you're not comfortable with & embarrassed about so that adds to the stress too. Give yourself a break! This is all new & you need to give yourself a chance to adjust & accept yourself...every part of it. Even the parts that people judge.
That's hard!
But like you said "it was the most anxiety ridden 2 min of my life."
Key here is....2min. And you lived thru it & could breathe afterwards. You did it!!!! So take baby steps. Look at the bigger picture & tell yourself you're pretty dam unique which is what makes you so special!