Elton got it wrong. "Sorry" isn't always the hardest word; "no" can be pretty tough too. If your schedule is always overflowing, it's probably worth getting reacquainted with this two-letter word. If you find it hard to say no to extra work, too often cave into your kids' demands or find your social diary cluttered with people that they don’t actually like, you could be one life's people pleasers.
Of course wanting to make people happy is not an intrinsically negative quality - but it's important to train yourself to be less sensitive to other people's needs and more aware of your own. That way you'll stay in balance - and in control.