I don't know

Yesterday I was still sure
Today I am not
Why I don't know
Maybe tomorrow I will be again
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Always on my mind
while I'm in school
While I'm eating
While I'm studying
While I am playing
Even now
While I sit here listening to Sarah's Angel
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It's been awhile
So strong it is
It's always so
But this is different
It may end the same
It might end different
It might not end
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I'll try
I'll really try
I hope it's going to be different
This one is different
I can feel it
I just know it