I can’t do this

I said I can not do this

I’m not confused
I just can’t do it

no, the problem isn’t that I don’t know how
I know how
I know how to do it
I’m not stupid

the problem is
I just can’t do it
I don’t know why
I just can’t

I already told you
I don’t know why

I am perfectly capable of solving the problem
but I just can’t do it
no matter how hard I try