I found out the earth was flat on August 2015 after watching one of Math Powerland's videos. I came to the conclusion based on having travelled all over the world and having already seeing a flat plane below.
There seems to be no curvature, however I can't go high enough to see all of it, so I can't give an unshakable fact. Beyond what I see with my own eyes, all I have to go on is NASA lies.
Patricia Steere has been my most influential Flat Earther, I basically ripped off her show. Any good explanation gives me goosebumps, most recently YouTuber Dilly Gill explains how the space shuttle was a vomit comet/ zero g plane. My jaw was in the floor during most of his videos.