That will depend on many things. For example, are they really close friends and are you sure you can trust them? Is your behavior too disruptive, or just excentric? If your behavior is too disruptive and affects your friends or your work together then you should probably tell them, in a way to explain your behavior. Just try to provide enough information or they will probably draw their own conclusions. You are an adult now, so probably your friends can handle the info and be mature about it. But make sure to be psychologically prepared for rejection if it gets there. Good luck!