Please consult with an OISS Advisor for the best plan of action. It may be best to return to your home country to change your status, because it can take 10-12 months for the U.S. Citizenship and Immigration Services (USCIS) to process a change of status application from within the U.S.
For information regarding a change of status from within the U.S., go to: https://www.uscis.gov/i-539. Please contact OISS before pursuing this option.