I've been a fan for 10 years. 10. whole. years. I can't remember the exact date of when I started getting into My Little Pony, but I can probably narrow it down to September of 2015.
It started when I first discovered some Pokémon music video that was set to "A True True Friend". I was rather surprised when I found out that the song was originally from a My Little Pony cartoon. I have heard of the franchise’s name before then and I initially dismissed it as some childish show targeted to girls, but after watching that and another video set to the Cafeteria Song numerous times, my curiosity got the best of me and I looked more into the characters on both the show’s wiki and TV Tropes. The first episodes I watched were Stare Master, Rarity Investigates, and Read It and Weep and I’ve pretty much been a fan since.
Instead of asking how you got into MLP, I'll instead ask what your first thoughts were as you were first becoming a fan? Were you dismissive at first like I was? How long did it take for the realization to set in, like, "Okay, I like ponies now"?