The answer to this question depends on multiple factors, such as type of anxiety present, severity of anxiety, presence of medical problems, presence of other mental problems, type of stressors, and style of coping, just to name a few. You can go to a doctor or therapist to get an assessment for anxiety.
To get started, you can take an anxiety test to determine if you have a problem with anxiety that needs to be explored further. Once you are able to determine what type of anxiety you have and the severity of symptoms, then you start to explore the various anxiety treatments that are available, such as CBT (cognitive behavioral therapy), prescription medication treatment, self-help for anxiety, and natural supplements for anxiety.
If you want to learn how to reduce your anxiety on your own, then you can consider the CBT-guided self help book, Anxiety Protocol:
You can also consider anxiety natural supplements such as KalmPro: