This was me. Wasn't til final year of uni where I understood what I wanted to do (when you find something you like, it doesn't feel like 'work')
Firstly, I wouldn't worry about what anyone else is telling you.
Secondly, forget about the grades and education. If you want to stop being lazy in any area of your life, you need to condition yourself to choose
delayed gratification over
instant gratification.This, in essence, is the root of your problem -- your brain hasn't learned to associate doing the **** you don't want to do, with feeling good.
If you instead of doing your work, you watch a movie -- then you instantly feel good, so that behaviour gets reinforced. If you condition yourself to go to the gym, it will feel pointless at first, but eventually once you start seeing good gains and getting compliments from people etc. which make you feel good, only then does your brain realise that "doing **** I don't want to do right now will lead me to feeling good later". And depending on how good you feel as a result of putting in work, the stronger the degree to which you won't mind doing work in the future.
Once you learn to truly appreciate and experience the benefits of delayed gratification, you'll naturally do your work rather than going straight to the xbox.
So you need to switch up your behaviour in whatever areas of life you want doesn't really matter, set some goals that would be cool to accomplish and that require 'work' to get there. Achieve a few goals and
experience how good it feels to do so, and the benefits of those goals etc. and you'll realise that actually that 'work' is actually worthwhile, just not right now.
Initially it's quite hard to discipline yourself and you'll wanna fall back into your old ways.
You can speed this process up by rewarding yourself for doing **** you don't want to do, and withholding rewards (punishing yourself) whenever you take the 'i cba rn' approach.
Having this instant-gratification mindset isn't really your fault, you would have developed it in your early years. And you have the power to change it if you want.
Here's a helpful video on instant gratification vs. delayed gratification:
https://www.youtube.com/watch?v=47DmUM7MW7s