Whatever they say, don't believe them.
I have had chicken pox multiple times. I know someone who has had it 6 times. Yet, many docs say you only get it once. That's because they don't read the literature.
LJ when I was a little every runt had chickpox. You got it once and if you got it good you never got it again. At least this is what the Old Ones told us. It built up your immunity.
Now they don’t want kids getting that? Now vaccines for chicken pox? Nope sorry, I believe the Old Ones.
No offense but I seriously doubt your claim........
However, if you're telling the truth then not only you but especially your friend are true anomalies of nature and belong in a secret research facility where they perform all sorts of horrendous tests on you and your friend to determine why you've never developed an immunity to that virus...........LOL!