Why don't I listen?

Monday night I was very sore from the 4 classes I did over the weekend and had a discussion with my trainer, Tina, and she told me I SHOULD be taking Monday off.  However, I told her I had promised Emily I would be at Spin so I was going and I did.  She then told me it sounds like I am overtraining and suggested I slow down and take Tuesday off, which I agreed to, and then realized that kickboxing was on my workout schedule and Wednesday (today) I had nothing scheduled.  I decided to go ahead and go to kickboxing, because I was feeling so much better yesterday and knew I would be taking today off anyway....BIG MISTAKE!  I should've listened!!  Why didn't I listen!?!?!  I felt great before kickboxing, I felt great DURING kickboxing, I felt great when I climbed in my truck....and then 10 minutes later I slid out of the truck in my garage and it hit me!!  I am in a crazy amount of pain.  The worst two parts are in my hip/butt cheek area and the outside of the shoulder/upper arm.  I feel like I've been punched over and over and over again.  My whole body feels almost bruised and I can barely function.  I think I only moved ONCE all night and groaned the whole way from my side to my back as I rolled.  In some strange way it kind of feels good to know I pushed my body to it's limit, but now it's time to back off for a bit.  Today I for SURE will be taking off of all exercise.  I'll be drinking LOTS of water and doing LOTS of stretching throughout the day.  Tomorrow, depending how I feel, Zumba.  This weekend....to be determined.  I have Kickboxing and Vinyasa Yoga on the schedule for Saturday and Sunday - Zumba followed by restorative yoga.  IF I do ANY classes this weekend, it will only be ONE each day.  Part of me feels like I should do yoga, because I think of yoga as relaxing and lots of stretching, but the truth is, it is also a lot of strength training, which I do NOT need right now, so we'll see how the next couple days play out.  Until then, I'm waiting for the "I told you so" from Tina :)