Mike has given you great information and showed you how to achieve your shape, can I change the direction slightly. In my opinion your problem has arisen out of not using the Pen Tool to do the job. The Pen Tool is the backbone of Illustrator and is the most used tool on a day to day basis and to not use this tool is going to stop your development in AI. Now I would normally post my own version of this but at the 2 weeks ago I had an SSD disc failure and I have not got my files back in the right directories so I have lifted this directly from Vector Tuts.
Start a new doc (Ctrl+N), Place this file into your doc and then lock that layer, Make a New Layer in the Layer palette - this is the drawing layer. Now this is a large bitmap which I have reduced down and can be found here with a few other ex. that you might want to try: http://southeastcc.files.wordpress.c..._exercise1.jpg
The attached file is not good quality so go to the supplied web address and download it to your computer. There is a lot of help here and throughout the net so don't be afraid to ask. If you want to use Illy you are going to have to learn how to use the Pen Tool.
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