Write an Instant "I Used To..." Poem

Method:
Line   1 I used to
Line   2 But now I
Line   3 I always
Line   4 But I never
Line   5  I once
Line   6 But now I
Line   7 If I could
Line   8  I would
Line   9  I never
Line 10 But I might
Line 11 I can't
Line 12 But I can
Line 13 I won't
Line 14 But I might
Line 15 I used to
Line 16 But now I


Sample:

 I used to think that summers stretched slow and lazy for a year
But now I know better
I always thought "school one year, summer one year"
But I never counted off the days on my fingers
I once felt hours stretch long and easy
But now I hear a panicky tick-tock
If I could step into a time machine
I would go back and reset the clock
I never gave it a thought before
But I might seriously consider it now
I can't turn life into a sci-fi movie
But I can gobble up every day 'til I'm filled up happy
I won't ever be 16 again
But I might be a teenager at heart
I used to think that summers stretched slow and lazy for a year
But now I know better