You prefer staying home. You find large groups draining. You go quiet in meetings and feel relieved when plans get cancelled. Everyone calls you an introvert. But you also spend three days dreading a social event, replay every conversation afterward looking for what you said wrong, and feel a specific dread around being judged rather than simply a preference for quiet. Introversion and social anxiety are not the same thing, and the difference matters enormously for what you do about it.
Yes, and this is where the confusion most often comes from. Introversion and social anxiety are independent dimensions. An introvert can develop social anxiety. An extrovert can have social anxiety. The two are not the same construct and do not come packaged together.
An introverted person with social anxiety experiences both: a genuine preference for less social activity, and a fear of negative evaluation that makes the social activity they do engage in distressing. For this person, telling themselves they are "just introverted" becomes a way of rationalising avoidance that is actually driven by fear, and that avoidance maintains and worsens the social anxiety over time.
The distinction matters for treatment. Introversion needs no treatment because it is a healthy personality trait. Social anxiety does not resolve on its own through avoidance, and the avoidance that feels most comfortable is precisely what maintains it. CBT for social anxiety includes graduated exposure to feared social situations, which is uncomfortable and genuinely effective. No amount of embracing your introversion addresses the fear of judgment that is making social situations distressing.
If social avoidance has cost you relationships, opportunities or experiences you genuinely wanted, and the reason was fear rather than preference, that cost is real and the cause is treatable. The longer social anxiety goes untreated, the more the avoidance becomes entrenched and the social life becomes structured around it.