The earth is round. A flat earth is a physical impossibility. You hold to a belief that has been proven untrue, so doesn't even meet the standards of a religious discussion, which I would also not be interested in having.
You tagged me. I didn't want to insult you and I actually don't intend to do so now. I'm just being blunt.
Here, read this:
http://www.smarterthanthat.com/astronomy/top-10-ways-to-know-the-earth-is-not-flat/
Explain these observations:
Gravity is the same all over the world
Observers at higher elevations see objects that are farther away
day and night are at different times at different locations on the earth