There are two kinds of anxiety:
1. The caused by objective life problems: no home, no money, lot of hunger, or to summarize, when you know you are totally unable to reach the minimum life quality of the society you live.
And 2. The caused by odd wires in your brain that provoques extreme reactions (fight or flight responses) to daily common and not life-threatening events other people have no problems with.
Thay always have a root cause, that can be solved with lots of work, but at the end of the day, is your brain creating a fight or flight responses from no important thing, and in that way, we could say the anxiety is created by you.
So, for you all who are suffering from anxiety, do an effort and start thinking that you can have some kind of control over it even if it needs lot of help from a therapyst. YOU. ABSOLUTELY. CAN.