Trying to build upon "it sucks that ..." seems to create a bunch of weird self sabotaging behaviours in my experience. Since I tried moving away from that I've found it easier to motivate myself to do things that aren't immediately rewarding. And perhaps more importantly, the journey there seems more enjoyable.
And I think it makes a lot of sense that using a carrot instead of a stick on yourself produces more consistent behaviour. You move towards a carrot and you flee from a stick. You can flee in most directions.
Changing the way you think about yourself takes a lot of time though. Impulses are deeply rooted.