We are in the habit of exaggeration, or imagining, or anticipating, sorrow.
Do you have a positive imagination? Focus on being competent in the now. Let yourself feel good about your competence, even in the smallest of things. This feeling will build if you let it and will lead to a healthy confidence. If you are confident in the now, your view of the future will be more optimistic. Think, write and really describe a positive image of tomorrow. Return to this positive image frequently.