Anxiety is a diagnosable medical condition.
Being anxious is normal, everyone gets anxious/worried.
Anxiety is when it takes over your life and affects your ability to function day to day, when it becomes abnormal.
AIBU to tell people to stop saying you 'have anxiety' unless you have actually seen a Dr or someone professionally qualified to diagnose it.
You're making it much harder for those of us with medically recognised Anxiety Disorder to be taken seriously.