[android help] Copyrighting published code so that others don't copile and sell my work

Basically I have some code published online. It is very unlikely that anybody will find it and/or link it to my android app. (project and product names differ). I Just want to include a license agreement in my published code that protects me from someone else using my code to do the exact same thing to compete against me. I have looked at the GNU public license but it is copy left. Does that mean I can not claim this right on my code if I plan on selling it? I think what I want is the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Which states others can't use my code for commercial use. But does that mean I can't use the code for commercial use? Thanks asked 3 mins ago

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