I feel anxious all the time. Im not sure if I have anxiety disorder.
If you already know that you are anxious most of the time then you probably do have an anxiety disorder. Any bigger feelings of anxiety or fear fall into that category.  Did something trigger it that you know of?
Not that I know of. How does one treat anxiety?
Treatment depends on the kind of anxiety you have.  There is such a variety from generalized anxiety disorder, specific phobia, social anxiety disorder, separation anxiety disorder, agoraphobia, and also panic disorder.