It is about me

My name is Alyona. I am kind and gentle, but serious girl. I'm not frivolous and I don't like the immoral people. I prefer to communicate with a kind, honest and courteous people.

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- You could say "I am kind and gentle, but serious" or "I am a kind and gentle but serious girl." 

- "the immoral people" sounds like you're talking about a certain group of people.