Stretching yourself too thin

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I constantly find myself trying to help others or do odd jobs to make extra money. My husband and I live a nice lifestyle. We don't need extra money (although it would be nice) we can pay the bills and still have extra at the end of the month. What is this that drives me to want to do other things. I found myself tutoring my babysitters son on internet usage and clean up and even offered to tutor him in english without consulting my husband. I've taken on odd jobs like invitation printing and photography to help out friends. I get paid for everything but my husband HATES it. How do you say no? Why am I like this? Does any one else volunteer for everything because they feel obligated?