Self-discipline: How can I learn to do things I don't feel like doing?

You change your identity.
Your will power isn't enough. It has to come from within.
Have a burning desire , or what someone called magnificent obsession, and renunciation becomes easy.
Example: CR7 is one of the greatest soccer players, he has an obsession with being the best. He doesn't smoke, he doesn't take drugs, he doesn't consume sugar, and he doesn't drink.
Was it hard for him giving up all the vices?
Not a bit.
I used to be addicted to pmo, caffeine, energy drinks, soda, chocolate, and negative/ worrying thoughts.
I became obsessed about becoming a better man , and i easily gave up on them all.
( witbdrawal symptoms were tough though)

 

It's not about 'how you should do it'. It's about the way you choose to engage with it. It's about the mindset that drives you each day. Are you doing it because you are determined, desperate, angry, needy? If so, then these are all emotionally strained forces behind the change you want to achieve and that will lead to failure because these emotions are volatile, unpredictble, explosive and short-lived. They are born from fear and loathing and are ultimately negative, so can only produce negative results.

Or are you doing things because you actually enjoy doing them? If you come from a plce of genuine love and desire, or 'want' for something, then it'll be a walk in the park. Genuinely wanting to do something because you actually ENJOY it, will be a hell of a lot easier than if you are coming from a place of confused need, or desperation.

 

when you have a staff monitoring everything you eat and forbidding you to eat most of the things you like it is not that hard, especially if you train 4-6 h per day(not including workout).

 

You missed the whole point mate.
Other players have what he has got but no one renounced more than he did.
Go read about his strict regime.

 

i hear you but those *vice* is not something any serious athletes would do, i remember balotelli being spotted smoking and it caused a big-ish scandal what i am getting at here is that in their world this kind of thing is expected.

 

Ronaldo's diet is extremely strict.
His training regime is also strict.
So many footballers smoke.
The man has sacrificed even before becoming a pro.
The point i am making is that when u are obsessed with a goal, giving up anything that will stop you from achieving becomes easy.