I payed State tax the first two months of 2019, but it is not shown on my 2019 W-2

I payed State tax of the first two months in 2019 by myself, I have the confirmationn number, but it is not shown on my 2019 W-2.   So when I finished my 1040 form, it  shows I still need to pay the first tow month tax which I had already payed,   What I should do?  how to fix this problem,  Thanks a lot.