As someone who recently had a significant amount of hair cut, though it is stil fairly long, I am an expert on the issue.
Stage 1: Shock
You can't believe you actually did it. You've never had short hair. What does it do? How do you style it? How will this affect wash/dry time? You'll have to readjust your entire morning routine.
Stage 2: Denial
I mean, it's shorter, but you can hardly tell, right?
Stage 3: Anger
WHY WHY WHY WHY WHY?!?!?! What could possibly motivate you to do this to yourself? This is not kindergarten. You're not discovering scissors for the first time. You want to be upset at your stylist, but can only blame yourself.
Stage 4: Bargaining
Maybe you should cut your losses and get a perm or dye it a crazy color or something.
Stage 5: Guilt
But that just makes you remember how long, healthy, and beautiful your hair used to be.
Stage 6: Depression
Your neck and shoulders will freeze without the proper insulation. You brought this upon yourself and have no one to blame. You know what? Your hair will probably never grow out again.
Stage 7: Acceptance
It's kind of cute, though. And weighs a LOT less. You can actually straighten it without going down to your waist. And also you remember that you look amazing in everything.
You'll probably grow it out for another year or so, but now that it's grown on you (pun not intended but we're sticking with it) you'll probably go even shorter next time.