I did 20 years and I completely understand how you felt at the time. Guys like you that stayed in made the best leaders because they demanded to have an opinion. Those were the guys you could leave in charge of something knowing it would get done.Kinda funny, I don't think I have a single pic of me in uniform.
When I got out, I was so fed up with military life, I pretty much purged everything. There was a barrel at Ft Dix (where I mustered out), to toss all your military clothing etc, if you didn't want it. Most everything GI went in that bin. Only thing I kept was a DD214, a division shoulder patch, and a pair of boots (only footgear I had).
Don't get me wrong, I don't regret going in, and would do it again (with a different MOS). I think everyone should do a tour in the military. It's just that some folks thrive in that environment, and some chafe.
I came out rubbed raw.
Can't stand being told what to do. By anyone.