I've never worked at a larger company (>100) so I could be wrong but I don't think I'd enjoy it. Endless bureaucracy, office politics, and stifling policies. At a smaller company I can see my impact directly, I have the power to actually make decisions on how things are done, and I get to build cool new things. Don't assume that big companies know "the right way" to do things, they are just as fallible and sometimes even more so. They can fall into the "that's the way we've always done it" much easier than smaller companies. Also I can tell you from personal experience that more people/engineers does not mean a better product. A better funded one maybe but without naming any names let's just say that I've consumed APIs or similar from massive companies that I once looked up to or put on a pedestal and their API was trash and/or their software was a mess. It really helped break my long-held assumptions that they hire the best talent and produce the best code.
Don't feel like you are missing out, you are only missing out on a bunch of headaches IMHO. I've only worked for smaller companies and I have no doubt I could swing a job at a larger place if I wanted, I regularly ignore recruiters from AWS and the like because I don't want to work in that type of environment. Do what you like and make sure you get paid well for it, past that don't worry about company size.
Don't feel like you are missing out, you are only missing out on a bunch of headaches IMHO. I've only worked for smaller companies and I have no doubt I could swing a job at a larger place if I wanted, I regularly ignore recruiters from AWS and the like because I don't want to work in that type of environment. Do what you like and make sure you get paid well for it, past that don't worry about company size.