Congratulation Freelancer... you fit right in with 97% of the population...
How many people start out on a diet and quit...??? How many people start going to the gym or doing exercises and quit...??? How many people start on any good and self-improving habits and quit...??? I am very conservative when I say 97%... it is probably even higher than that... so, buddy, you are not alone...
So, don't deprecate yourself because you follow what is almost normal and natural behavior...
Now, what could be done to improve your "stick-to-it-ness..."
First would be to never start a new program on the spur of the moment while only driven by the enthusiastic feeling that "this is going to change your life for the better..." Everything has a price... and sometimes the price is not worth the effort...
Second, if you make a public commitment... that is, announce to the entire world what it is that you are starting up... chances are that you will stick t it...
Third... don't be in too much of a hurry to attain perfection... it took me years... j/k
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