Your friends have a bigger impact on you than you know. You probably don't even realize how similar you are to your friends. Whether it is a long time friend or a new acquaintance it will only be a matter of time before you start acting like them. You might pick up phrases that they say or certain character traits that they have. This affect could be for good or for bad. If you become friends with a really nice person that will rub off on you and you will be nice. But the same goes for the other way, if you surround yourself with a bad crowd you will, undoubtedly, get some of that.