Do people think you are "too serious" at times? If you hear this too often, the natural reaction would be to take it as criticism - after all, you are only trying to understand yourself and others. Other people might actually be picking up on your dedicated nature to help the needy, to work for a cause. In order to integrate your inner nature with outside events, look into group activities, if possible, such as "Walking for a Cure" or other athletic events which benefit a cause.