Cognitive-behavioral therapy is the best way to go. Basically, learning new behaviors and ways of thinking that cannot also exist with your current tendencies. A big part of therapy would be identifying the root of the problem and resolving those issues. Therapy isn’t like the movies where a psychotherapist will retrieve some repressed memory and then there’s a major depressive episode with flash backs and hugs. It’s usually a gradual process that is accomplished by 3-12 visits that are typically covered by insurance. Your relationship with the therapist is important for success, so don’t be afraid to shop around until you find a psychologist that works for you.