Fully agree. Just like some people have addictions like smoking, drinking, drugs, etc., who likewise can't just "get over it".
I've had social anxiety all my life. It's only in the latter years with more widespread information about it, that's I've realised what it is, rather than just me being inexpicably weird. That knowledge has helped me understand my actions, and I'm slowly (very) making progress.
I just "freeze" in social situations, I'm literally unable to speak to strangers, and even very tongue-tied with people I know well like relatives, work colleagues, etc. In work situations, I can talk the legs off a donkey, no problems at all, but the talk is all about work, not chit-chat, small talk, etc., I'm very much "all business"!
Sometimes, in social situations or even when out walking or in public places like supermarkets, I go into "flight" mode and actually intentionally ignore people by pretending not to notice people nearby, pretend not to hear them, pretend I'm engrossed in something else like reading something or looking at my phone. I know I'm doing it, but I don't know why, and I don't know how to change that behaviour. Often I actually want to talk and interact with them but just can't bring myself to do it.
It's weird.