Hobbies have been around for what I can only assume is as long as mankind has had the ability to think beyond their more basic needs. Where historically our ancestors may not have had time to think of much other than food, shelter, and survival, most of us have the luxury of thinking beyond those necessities. If that is the case for you, you might have hobbies that include dancing, bike riding, working out, crafting, auto mechanics or much more.
Personally, my hobbies include working out, game design, hunting, playing the guitar, self help studies, and psychology. Whether you share any of these hobbies makes no difference. In fact, there are probably few in the world who share my exact same list of hobbies. That's just yet another great part about them. Hobbies can help make us unique, exciting, and fun to be around. This can then influence others around us in a positive manner. That's not to mention the positive effect that a hobby can have on you, yourself.