3 mistakes people make when deciding their New Year's resolutions, according to a psychotherapist

For some, setting your goal start date to January 1 can backfire.Nora Carol/Getty Images
It's easy to make New Year's resolutions, but often tough to keep them successfully.
Psychotherapist Amy Morin says creating a goal that's clear and measurable will help. 
Don't overwhelm yourself with the scope of the resolution — keep it obtainable.
Resolutions are easy to make — but tough to keep. In fact, a study by Scranton University found that only 19% of people are successful at keep