People often avoid situations that may cause stress or anxiety. Unfortunately, avoidance heightens anxiety because it prevents the person from learning that they can get through these situations.
If you've been avoiding things, it might be time to start slowly facing your fears in order to conquer them by setting goals. With practice, as you keep facing fears, you'll reduce your anxiety and build confidence.
What small step could you take toward your goal? Start with easier challenges and work your way up to your biggest goals. The important thing is to stick with it and not give in to your urge to leave a situation. If you stay and use skills like deep breathing, you'll notice that with time your anxiety decreases.