Ok my Theory about Saitama's Past is that he is an Orphan and the Adults in his Life F*cking Failed Him.
Because The Teacher in his School 🏫 is a F*cking B*TCH!!! Everytime he tries to tell them the Truth they think he's Lying 🤥 and He has Zero F*cking Friend
Like DAMB! He's a Lonely as F*CK!!!
After Reading the Manga and Anime, I think Saitama has F*cking Autism.
• Autism - A developmental disorder of variable severity that is characterized by difficulty in social interaction and communication and by restricted or repetitive patterns of thought and behavior.
He has F*cking Alexithymia...
• Alexithymia - Lack of emotional awareness or, more specifically, difficulty in identifying and describing feelings and in distinguishing feelings from the bodily sensations of emotional arousal.
Ok maybe not that one but you get the Idea!
His Childhood is F*cking SH*T!!!
That's literally a HUGE SLAP IN THE FACE!!!
Sigh..., I think he never got diagnosis from a Doctor.
I could be entirely Wrong 🤔 and he's just an Socially Awkward Person who sucks with Social Cues.
Never mind it's either of those 2 >:(
He was not even lying at ALL!!!
Honestly, it's common for people with Disabilities too not fit into society 🙄 since it's not built for them to live in.
Also his experience is kinda familiar what Autism people go through.
Since it seems that Saitama desire social relationships when he was younger, but he find it Challenging to Maintain Stable High-Quality Friendships.
Even worse, a majority of Autism Adults have reported that their childhood interactions included traumatic events, exclusion, and Bullying, which can lead to Self-Isolation out of Fear.
Which I can totally see that happening to him...
But remember it's just a Theory
And this is just my Personal Opinion and it's not Cannon into the Show or Manga.
I hope Saitama will have a Happier Life in the Future and find people who actually cares about him ❤️ like Geno & King and probably Mumen Rider too.