Hello, I am an immigrant and have immediate family members. Excuse me, 18 years old, what do I need to do to change from a green card to a citizen?

18 years old, can apply for citizenship independently. In the United States, you have lived in the United States for 933 days in the five years before the date of submitting your application, and there is no record of leaving the United States for more than six months. Then, you have to face the interviewer's exam during the interview and swear allegiance to the United States of America. Then, you can become an American citizen and get an American passport.