And isn’t it supposed to get easier?(not slang)

I cannot run anymore,
And I’ll fall if I even try,
I’m beyond tired,
I just want to go home,
I’ve run my whole damn life,
And now I need to let go.

You think that I’m so strong,
Well thank you but you’re wrong,
Whatever energy I had is gone.

And isn’t this supposed to get easier?
I just can’t stop thinking of what we were,
I try to look forward, but it’s all a blur,
I insist to hold on, and I’ll never learn.

I used to pick myself up,
If ever I would fall down,
This time I’ve had enough,
I’ve no reason to stand now,
I’m giving up on love,
I feel my heart slowly disavow.

I’ve held out for so long,
And thanks, but I can’t hold on,
I’ve been lying to myself all along.

And isn’t this supposed to get easier?
I just can’t stop thinking of what we were,
I try to look forward, but it’s all a blur,
I insist to hold on, and I’ll never learn.