You should pay FICA taxes for the year 2019.
As an F-1 visa holder, you are exempt from FICA taxes up to five years you were present in the US. Therefore, you do not pay FICA taxes from the year 2014-2018.
For the year 2019, if you were present in the US for more than 183 days, you are considered as a US resident for tax purposes. Even you are still on an F-visa, you are no longer a nonresident anymore. Therefore, you would need to start paying FICA taxes. See the IRS source:
From the IRS website:
"This exemption also applies to any period in which the foreign student is in practical training allowed by USCIS, as long as the foreign student is still a NONRESIDENT ALIEN under the Internal Revenue Code. Foreign students in F-1, J-1, M-1, Q-1 or Q-2 nonimmigrant status who have been in the United States more than 5 calendar years are RESIDENT ALIENS and are liable for social security/Medicare taxes (unless they are exempt from FICA under the "student FICA exemption"(...)"
I hope this clarifies the confusion.
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