Samsung SyncMaster 931BW 19" has a weird resolution?

Hello everyone!
I am using my MacBook for some years now. I never had ay problems with it, it has always worked properly. Recently, my mother gave me an old screen she did not need anymore, the Samsung SyncMaster 931BW 19''. I have some problems with it. The resolution is very very weird. When I connect the screen I get a popup that sais:
Not Optimum Mode
Recommended Mode :
1440x900     60Hz
I know this is a 16:9 configuration. The only configurations I can get are 1600x1200, 1400x1050, 1344x1008, 1280x960, 1024x768 and 800x600. As far as I know this are all 4:3 configurations. That is not what I want. The screen kind of scales it to the screens resolution but it looks so weird.
When I make a screenshot of it I get, again scaled, a 4:3 ugly pixelized PNG file. I do not like this.
Besides the resolution problem I also get a weird color. I cannot set it to the right white point and also not the right GAMMA mode. Which makes it almost impossible to see anything on the screen. I tried in the screens options menu to reset the color and the image but that did not change anything. I tried to calibrate it in System Preferences but that only made it worse.
Please help me with this. It really bugs me.
Specs:
MacBook Pro 13'' Early 2011
Samsung SyncMaster 931BW

Also, when I click on the Apple logo in the top-right of the screen, I go to "About this Mac", then go to the tab Displays, it shows me two displays:
Built-in Display
13,3-inch (1280 x 800)
Intel HD Graphics 3000 384 MB
Display
13,9-inch (800 x 600)
Inte; HD Graphics 3000 384 MB
The first is the display of the mac and the second is the Samsung monitor which actually is 19'' with a resolution of 1440x900! I think my MacBook doesn't quite understand me.

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