Are these good with the grammars?
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Jenn123a wannabe rowdyThis is odd because it is not natural or common in English. You should explain what it means so that it can be rewritten in an understandable way.
Jenn123I guess it should be more natural to use gangster instead of rowdy.Yes. Have a look at the definition of rowdy and the examples of it being used, here http://dictionary.cambridge.org/dictionary/english/rowdy They make it clear that you have not