what is the meaning of "mature"?

today im very free in da office! so i pla messenger chatting a hole day~ i met a net friend. we talk about a title is people! but she keep on shoting other is stupit and always act cute and funny is not mature...always said:" be mature lar, be mature la" along chatting finally i also cannot tahan any more! i just shot her back what is mature? for me i know mature is a unvisualble thing! its a mental thinking problem! no matter how a person act like, its not mean that that perple is childist or mature! when you facing problem and how you try to soft it and thinking for the next step, how to make mmoney to take care of family, how to be happy in your live! thats call mature! with positive thinking! finally i just send her a question! are you born to hate people or like people!? why god create human for? think about it who saw my message!