Think about this. You've probably seen pictures of Earth on the internet. But have you actually seen that it is round? You can only look at the Earth from one perspective, so there is no possible way for you to see that Earth is round. I personally believe that Earth is round, but what do YOU think?
There is even a website about this topic:
http://www.theflatearthsociety.org/
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Two things: 1. It's actually an ellipse. It's not perfectly round 2. There is another perspective that it's spherical, which is how they discovered this back on the day. You can see the curvature of the planet on the open sea of you look off in the distance. I really hope I wasn't trolled...