Ok not quite sure if you are serious or trolling but I'll bite.
The more applications or services you have running the more ram they are going to use. Some apps can be more memory intensive than others games for example. You are utilizing less than half of your ram capacity that is not bad at all. The amount you use will fluctuate depending on what is running. If you notice unusually high memory usage you can stop your apps one by one untill you find the culprit. Android handles multitasking pretty well so no need to bother with a task killer they tend to cause more problems than they fix. Your usage shown in your picture looks just fine to me. My suggestion is don't stress unless you are experiencing a problem and enjoy your phone.
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