The Earth is not flat. End of discussion. Oh, go right ahead and not believe it if you want to, but might I suggest getting an opinion that isn’t so easy to disprove? We have been in space. We have photos. Hell, if you go high enough in an airplane you can see the curvature.
I understand that the notion of being stuck to the outside of a huge ball hurtling through space held down by nothing but gravity is a scary notion, but this seems like an odd notion to hang on to..