To be considered a adopted child following requirements should be met:
1.You were adopted before your 16th birthday.
2. Your adopting parents had legal custody of you for 2 years before or after your adoption
3. You have resided with your adopting parents for two years before or after your adoption.
If you meet the above requirement your parents can file form i 130 and you wait for visa to be available(maintain your f1 status).
Your question is not clear. How were you adopted ? Also if you were an orphan at the time of adoption you will automatically be a us citizen...
Consult a good lawyer