Dear friend, Why you do not think marketing is not career.Lot of person doing marketing job. you ask your question to successful marketing person he will clarify you in better way. Initially you need to do hard work then day by day your confidence will improve then you will realize marketing is good career. by marketing you will earn money,increment in contacts, improvement in your personality, ability of talking will improve etc lot of gain you will get. only think is required you try to start positive thinking. do not think negative. rest is my best wishes with you