That's exactly what it is, procrastinating means you keep postponing decisions and actions, but when are you going to actually do the thing? This is not a "test life", this is literally all the time you have and once you wasted it you'll never get it back in any way.
It's not really like digging your own grave but if you procrastinate you're not living your life, you're just watching it being not-lived.
Discipline is what makes you achieve what you really want, because let's say if you say "i want to be super fit and ripped" that's something you say you want, but your body keeps telling you McDonald's and sitting on your sofa is not that bad after all. But what you really want, because you rationally said you want it, is being fit. If you have no discipline you'll keep letting your "body" control your life, and never achieve what you really want.
It's like if you do nothing actively everything will happen TO you, and not BECAUSE OF you.
If you want to boost productivity buy a huge countdown timer and put it on the wall in whichever room you spend most of your time in, that's going to make you realize time passing a lot more. I set it to 100 days countdown every 100 days, will reset it on NYE too.
Time is the scariest thing, it passing right now and you have to act now for tomorrow, if you act tomorrow stuff is going to happen one day later, and we only live 70/80 years, which is nothing, 70 years is 25.550 days, if you're 20 you're almost a third into the 25k day countdown.
75 years is 900 months, check this out, this is what a 29 year old life looks like.