I would like to go back and see what my very first post was 6 years ago. Is there a place I can go to see all of the old posts?

It's not unfortunately, no.

Late 2010 seems the earliest.

No, it isn't, besides a few special archives created by various users and hosted in various places. the way back machine also has a limited archive of some really old stuff.

It's probably for the best. I don't want to know what my posts were like. It'd be terribly embarrassing. Either because they were far worse or far better, I'm not sure.

I bet they were longer, at least.

My original posts in the Skyrim section where things like 'Yay Skyrim' for a hundred posts so i'd rather not see that!

That's recent enough that it's probably all still here.