I understand where you are coming from...looking from the outside in a number of my friends would comment that I have the "perfect" life/family and yet sometimes deep down within myself I too dont feel 100% satisfied...but trying to pinpoint what it is that makes me feel this way - well thats another thread in itself.

Like lindsaymaree said
I think sometimes we are our own worst critics, and I know I'm always the one that puts more pressure on myself then anyone else.
Sometimes when you are such a positive person you find that you kindof work yourself into a state about your own life and situation...I know thats what I do. I hope that you can muddle this out and in the end you will see that you are doing a great job and that life isnt always perfect but it can be pretty close to it!