False. At the start of puberty, nobody is sure where they stand quite yet. Every incel doesnt know they are ugly subhumans, ever chad has no idea of their blessing. For the first few years of puberty, everyone is undergoing a new and uncertain experience. Around 14 though, people start settling in. Chad starts to slay and enjoy his life. After constant rejections and loneliness, incels start to realize something is off, but they are most likely bluepilled at this point and blame their social/emotional shortcomings as opposed to their looks.
This is all subject to change of course, until 18. Anyone can be the ugly duckling and transition from inceldom to slaying. Anyone can fall from grace after a burst of bad hormones.
The blackpill sets in for most users at 16 or older