I work as an interpreter for more than 4 yrs now,the job is stressful but i always feel anxious when i get informed that i will be interpreting especially simultaneously.everyone assures me that i am very good&one of the best,but i feel inadequate?

Read Daniel Amen's "Healing Anxiety & Depression" & "End of Mental Illness" & try transcendental meditation to reduce stress & walk daily in the woods to restore your homeostasis & be in balance with nature. Also look at "Seven Habits of Effective People" by Comey. Insert positive dreams while keeping a dream journal. Consult a psychologist for cognitive behavior therapy to strengthen your esteem.

A good way to overcome these long-term feelings of inadequacy is psychotherapy with a Clinical Psychologist with expertise in multiple forms of psychotherapy. You can have Zoom sessions.