If you were admitted in 2014, your five calendar years of exempt status would have ended at the end of 2018, as long as you have met the conditions of visa. You should have been filing 1040-NR ( if there was any US sourced income). In 2019 you would be dual status --- Non Resident Alien till you meet the 183 days substantial presence test and thereafter residnt for tax purposes ( unless you requested to be treated as a resident for the whole year , known as first year choice ).
