I still struggle with discipline

I want to be a woman of discipline.  Why is that so hard for me?  I think because it goes against my very nature.  I am basically a lazy person at heart.  I know that to become a woman of discipline means that I work that muscle every day and as I do, it will get stronger and therefore more attainable.  I can't plan for anything further than today.  For today I will eat right and take care of myself.  That's all I can do.