i just received a passport from the greek embassy for schengen visa. I fly on 11th and they have given validity/start from 14th to next month. It says the visa has been issued on 7th. Can i fly on 11th despite visa has been issued but the start date is 14th? Kndly let me know please

I just received a passport from the Greek embassy for a Schengen visa. I fly on the 11th and they have given a validity/start from the 14th to next month. It says the visa has been issued on the 7th.

Can I fly on the 11th despite the visa having a start date of the 14th?