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Dear LW,
Before you go to graduate school to study for your career in international service, you should get real with yourself. Careers in service are not glamorous. At times, they can be monotonous and tedious. They require dedication and commitment. You should prepare yourself for the fact that things might get boring at times.
I am telling you all of this because it seems like you walk away when things stop being exciting. Perhaps you should consider a different career.