I think too many people mistake being anxious for having anxiety.
anxiety is perfectly normal, its a proportional response to a situation.
Having 'anxiety' in the clinical sense is a NON proportional response to a situation, either being over-anxious, or having anxiety where non is needed.
I was diagnosed with anxiety and clinical stress 19 years ago, I've been medicated for it on and off but its well managed, largely because I've learned to recognise proportionate and normal anxiety from the abnormal anxiety, and when the latter is starting to impact on my quality of life.
IE - worrying about driving in the snow -normal
Being so scared you can't even get in the car and put the key in the ignition because you'll get stuck on the drive, break the car trying to reverse it, skid on the ice and kill yourself and your children - not normal.
thinking someone has hacked you and changing a password - normal
spending 6 hours changing every single password you, deleting accounts and 1000s of posts on a forum while feeling sick, hyperventilating and ticking physically - not normal.
seeing a brown envelope drop through your door and wondering what it is - normal
Jumping the moment the postbox clunks and then sitting on the sofa curled up in a ball rocking/crying because you can't even bring yourself to go pick the post up off the mat because it'll have bad news and you're going to lose everything and they'll take your children off you because you're crazy - not normal.