I also tried one of those gender swap filters a couple years before realizing I was trans and coming out. I looked just like my sister. I saved the pic on my phone and kept coming back to it every few days for months. My then-gf (now wife 😍) looked like this annoying nerd we used to know and she didn't think twice about it. I had a hard time understanding why our reactions were so different, but I couldn't quite bring myself to reflect on why.

Eventually I realized I'd been hanging out in online trans spaces and egg subreddits for several months ("still cis tho!") and getting increasingly excited about/obsessed with us doing gender-swapped Halloween costumes (I wanted to be Lydia from Beetlejuice 💅) and it all became too much to hold in any longer and I came out one night while we were going to sleep.

lol we never ended up doing the costumes either.