New habit hard to form....because it is not a bad habit

I trying to form a new habit...but i have failed for the past one month.... someone said " it takes 21 days for a habit to form" I think it takes more than 21 days of trying to get it started... and another someone also said: "Motivation is what gets you started. Habit is what keeps you going." ~Jim Ryun I guess my motivation for the habit is not strong enough....... someone else said also: "The most difficult thing about morning run is to get out of the bed. Once you are out of the door, half the run is done" I guess my motivation to be on my comfortable bed is stronger than the urge to be in my running shoes at this moment