Let your yes be yes?

Something i realise is a lot of people, including myself have this difficulty saying no to things/favours, even if it is really out of the way. Which just leads to us saying a yes that we don't mean and end up doing whatever it is required of us with such a heavy and unwilling heart. I've been wondering why we do this, possibly its because we have more care with people than with the truth. We're so busy caring for people's tender sensitivities that we choose to forgo the truth "kindly" and suffer the consequences ourselves. Sigh, why do we make things more complicated ourselves?

I think it would be an easier go if i say no if i really don't want to do it. Cos i don't think there is a point of doing anything if your heart isn't in it.