Going from the great outdoors into corporate bullshit is one of the most depressing transitions one can make. Its a rude awakening.
Missing your old life is normal, but you will get where you need to by focusing on the future, which will always be different.
I've known a lot of folks who lived "the life" when they were young... only to get burned out by being a broke dirtbag living in a van down by the river. Many eventually turn to school, or some career change, as its very tough to live for a long time on next to nothing.
I also know a lot of folks who have a really good life despite holding down a corporate job (myself included). Corporate can pay well, and if you are in a good location, it can enable adventures. You gotta pay for creekboats, plane tickets and all the gear you yardsaled on bear creek.
In my mid 20's I went through an existential crisis... fed up with the bullshit of corporate america, wanting to connect with nature, wanting to find something more fulfilling. Now, older, wiser, perhaps less idealistic I have found that a good job keeps me financially secure and enables my adventures. Joy is found with family, friends, kayaking, camping, and adventures, and corpoarate pays the bills. Works for me.
Everyone has their own preferred path, and to each his own. One old school quote I really like... "there are many paths to the top of the mountain, but they all see the same moon on top".
Good luck on your journey, but by all means, get the fuck out of dodge if its not good.