The girl's parents object to her marrying you. Do you your parents agree? Is the girl Sikh or non-Sikh? If she is non-Sikh, will she get converted to Sikhism, or would you leave the Sikh religion in order to marry her? Why do you want a quick marriage? Do you or she think that once you are married, her parents cannot do any harm to you?
As the girl is only 19, I would presume that she is not gainfully employed. What are you? Are you a student or employed or doing business? Have you got income of your own or are you dependent on your parents? After marriage will you both be living separately as husband and wife or will you be living with your parents?