You mean, of course, that so far you have not seen any evidence which has convinced you that the Earth is round. That is not to say that there is not some evidence which would convince you; otherwise you would just be sticking fast to another dogma: that the Earth is round.
Most people have been convinced by the evidence gathered so far that the Earth is round, and this has been the accepted view on and off for more than two thousand years. The idea that the medievals thought that the world was flat is, apparently, a myth.
So: what evidence would convince you? Or is no amount of evidence enough? Do you need to see a round Earth, from space, with your own eyes? Or would this still not suffice?