Some have become better people for it and you will find yourself closer to them than ever. Others have changed so much that you don't even know them anymore. This is when you realize who your true friends are. You know your family will always be there for you, but friends will come and go throughout life. Your true friends are the ones who stick around forever.
College is a learning experience.
It is all about taking the responsibility of making your own decisions and taking the consequences for the ones you make, whether good or bad. These decisions are going to make you into the person you are going to be for the rest of your life. At college you no longer have your parents around to tell you what is right or wrong. It is up to you to decide. Though you may make mistakes, it is up to you to learn from them and become a better person for this.