You are eligible to file Form 1040 for the 2019 tax year.
When filing your return for the 2018 tax year you should have filed Form 1040NR.
Under a F-1 Visa you were unable to count the days present in the United States for any part of five calendar years toward meeting the Substantial presence test. Since you entered the U.S. in 2014 as of January 1, 2019 the five year limitation had been met.
In 2019 you satisfied the 183 days present requirement to be considered a Resident Alien for tax purposes.
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