Now that I am finally getting a divorce I am happier than I have ever been in my life. I feel guilty because?

my kids and my soon-t-be-X and my family and his family probably notice that I'm not all sad and mournful. Should I fake it. I don't try to act happy in front of them, but I just feel so amazing to be finally rid of him after 27 really tough years. I got my first checking account and credit card yesterday and I felt so liberated and amazing. I can now go buy a bra or some bread and I dont' have to explain to anyone!!!!! My god, why did I wait so long. Is it bad for my kids to see me happy?