Graphics tablets why are they hard to draw with?

I got a wacom graphics tablet i can usualy draw good with a pencil and paper but when i try the graphics tablet my drawings are worse then childrens drawings. Here is a sample of a drawing using the graphics tablet http://i27.tinypic.com/10oe7ab.jpg It is so hard to control the pen and the drawing. I use... show more I got a wacom graphics tablet i can usualy draw good with a pencil and paper but when i try the graphics tablet my drawings are worse then childrens drawings. Here is a sample of a drawing using the graphics tablet

http://i27.tinypic.com/10oe7ab.jpg

It is so hard to control the pen and the drawing. I use photoshop cs4 and thats the best i can come up with. Am i doing something wrong or does it take a long time to get used to a graphics tablet?

I just find it so hard to control the pen on screen
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