...it's unlikely you'll ever be willing to do it.
You tell yourself, I'll do a, b, and c, once I finish x, y, and z.
No, you won't.
That's not a grim perspective either; it's just that how you do anything is how you do everything.
We find all sorts of creative ways to suspend joy and keep putting ourselves last, and the only crime is when you don't understand why.
It has nothing to do with being lazy, lacking willpower, or finding joy in others' happiness; the truth is, there's intense pain (emotional attachments) beyond those stories, whether or not you realize it.
When you're attached to your past, it's challenging to access the present moment.
"The light at the end of the tunnel is not an illusion; the tunnel is." Said someone insightful