I like running and fitness very much, but my colleagues and friends around me laugh at me for being stupid and so tired. People say it's not my world. What should I do?
Let them laugh. It is a good habit to like fitness. Everyone has different hobbies. They can't understand your likes any more than you can understand their lifestyle. Don't mind so much. If you are willing to associate with them, just contact them less. Just be yourself. Don't change your lifestyle for irrelevant people, so you won't get used to it yourself.