Let's take your first body paragraph -
There are lots of social places in big cities like restaurants, museums, bars, sporting clubs, cinemas, theatre and etc. People in big cities have many options to enjoy their life and spend their times with their friends in social places in contrary to people living in small towns who have few choices and at most cases one bar or one cinema and one ... to socialize with their friends.
In body paragraphs you should give reasons to justify your opinion. And then you must support those reasons with examples. In what you have written above, the reason is ;
People in big cities have many options to enjoy their life and spend their times with their friends in social places
So you must give prominence to this. I mean, ideally you should have started the paragraph with this line. You can have cinema and other stories for your example to back this reason.