"The feelings aroused when [...] a whole new way of life is adopted can be overpowering. We may experience tremendous fear, [...] guilt or depression. Change, even wonderful, positive change, almost always involves some kind of grief for the old way of life we are letting go, even if that way of life kept is miserable."
I didn't realize I was grieving until I read this, and it all made sense. I get like this anytime major changes happen in my life... Like every time I ever graduated, and the time I opened my first bank account. Um, yah, my dad thought I was being ridiculous, lol.