There is an old saying, "keep your friends close and your enemies closer", but that's just retarded. In this day and age no one knows who a true friend is anymore. Sure you get drunk with people and they might drop by at your house to blaze a couple of times but how do you know they have your best interest in mind? How do you assume that this guy or girl wont stab you in the back? You can see obvious signs but what if they are no there? What if, instead of back-stabbing you, they encourage your destructive behaviour.
What I mean is what if some of these assholes you call friends push you towards failure instead of success. An example of this would be being a slut. Now think about a Girl being told by her "friends" its ok to sleep around cause "guys can do it". She is gonna sleep around and her friends are gonna keep on telling her "its ok" and there is nothing wrong with that. What the girl will fail to realize is that her friends are just setting her up either intentionally or unintentionally for a life of failure.
How you may ask? Tell me if you would ever date a girl who has been passed around more times than a coke straw at a Arab's party. Better yet how could you in good mind introduce her to your parents? At your wedding there would be all the guys saying they slept with her and you cant do jack shit about it. You might say I'm making this up but think about it. You Guys know at least one girl who you only call for sex and you girls know at least one girl you make fun of for being passed around.
So whats the best course of action? Find good friends to be around. Find the kind of people who tell you to your face that you act like a retard. Let them help you make better decisions that benefit your life. Or you could go through life like the world is your oyster and get a reality check when your 30 and its too fucking late.