Dear sir, I opt my GST no. in 19/01/2018 as Regular basis.My turnover

Dear sir, I opt my GST no. in 19/01/2018 as Regular basis.
My turnover is approximately 22-25 lac.
GSTR3 date is 20/02/2018, can I opt composition sceam immidiate.
Kindly suggest me asap.