Should I Just Accept the Fact That I Can't Discipline and Motivate Myself, and Live a Relaxed Life?

You don't have to turn your life into a constant self-improvement project. Rest and enjoy things, too.

But don't confuse being kind to yourself with giving up on things that matter to you. Start with one small habit, not a whole new lifestyle.

Maybe the problem isn't that you're lazy. You might be trying to live by standards that don't suit you. Build a life you can actually maintain, even on your less productive days.