To be honest I would guess that the only reason The GM made it possible to start with so much stuff is that he believed that it was impossible to fairly roll the rolls needed to start with so much stuff, but I proved him wrongUnless there’s something I’m missing is there any mechanical/table reason why your character has all this stuff or is it just the justification of ‘i got it in my backstoryTM’?
You could start with functionally exactly the same backstory of ‘was a slave, killed their owner and took some of their stuff, is now a wanted criminal dead or alive, reward 200g’ and only ended up stealing enough for the standard fighter’s gear/starting money, maybe a free horse that you rode away on (although just as likely you might have had to ditch it to prevent being identified from it and selling it is where you got your starter money)
But I’m not at your table I don’t know the specific circumstances, are the other players getting equal amount of loot from their backstories? I’m not saying what you want from your backstory is wrong but to me it feels unnecessarily excessive.