It’s not a matter of ambition or lack-of. Nobody is going into a 100k+ company and just changing the entire corporate culture around something as broad as bug fixing. These companies have hundreds of teams, and decades of entrenched culture. Sure, go in and improve what you can in your own lane, but be realistic about your scope and reach.
My outlook is "Sometimes if you have ambition and opportunity, you may be the person that can make things better."
I have made no claim or assertion other than that. If that's not realistic to you, then I sincerely and genuinely would advise you to seek therapy, because that sounds like depression.
