Yes, you can exercise too much. It's called overtraining, and what constitutes overtraining depends on the person.
You can find out more here: www.sparkpeople.com/resource/fitness_artic
Generally speaking, you should always have at LEAST one rest day, sometimes two. How much rest you need depends on you; and rest doesn't necessarily have to mean sitting on your butt, either.
Honestly, it sounds to me like you may be overtraining; that's a LOT of exercise; if you're working out more than an hour every day, that is likely too much. It's hard to say what you're doing, since you don't really clearly explain what you're doing when.
With too much exercise, you begin to break your body down instead of build it up.
Edited by: DRAGONCHILDE at: 9/7/2013 (20:40)