My life is a waste

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