It doesn’t matter how you feel.
It can be hard to discuss and process certain aspects of a stressful lifestyle. Art therapy does not require that its practitioners verbally express the stress they experience. Instead, they can express their feelings and let go of their unhappiness through art therapy.
Anyone, even artists, can enjoy these benefits. In fact, your artistic output is secondary to the emotional benefits that you can get from art therapy. You will gain greater insight into your anxiety and stress triggers and increased self-awareness.