Peter leaves home to experience the life going in the street.After going through rough times,he realize that he does belong to the street.

sounds like the Logline for biography of Buddha !

After going through rough times? is a bit bland. What bad things happen and who or what did them to Peter?

He realize that he does belong to the streets? This is not really plot, it is the conclusion. Plot is what he does to get to the conclusion.

Peter leaves home to experience the life going in the street? This is bland as well.

After escaping his hum drum middle class existence a (insert adjective) man must (do this) to stop (this bad person or situation) from (doing this) in order to survive the mean streets,?

That was just an example; you really haven?t given us what the movie is about. So it?s difficult to give a good example of what your logline should be.

A couple of pointers

- It sounds a bit plain, as if it's been done before. You might want to add in something that gives it a HOOK, that makes it stand out
- You should condense it into a single sentence. Use a comma, and its okay if the sentence is a bit long.