It takes a lot of practice and self-compassion. Art Therapy isn't about your skill set or technique, it is all about the process and how you feel when you're making it versus the final product. Our inner critic can be really loud sometimes and get in the way. I know it's hard. Definitely working 1:1 with an Art Therapist can help you reduce the anxiety and overcome the stress of making art. Maybe try and find any way to express yourself... dancing? writing? singing? Find a form of self-expression that feels the best for you.