Hi I haven't gotten my gst yet this year and I was wondering how I go abouts it would I have too file my taxes for this year ? I havent gotten my gst sense 2016/ 2017

You must file an income tax return in order to receive the GSTC/HSTC credit.  You should contact the Canada Revenue Agency to inquire about any GSTC/HSTC payments that you haven't received.  The phone number is 1 800 959 8281.