The fact is, your parents have behaved in a sort of similar way as you during their youth, they had their disastrous actions too!
As they grew mature and came to understand responsibilities, and the general 'Actions and consequences' thing as learned from their mistakes.
Parents seem to view their child's life as a rehearsal of their own, and easily put dramatic endings to certain events or behaviours, because they did just the same! And they too sometimes messed up. They are just afraid you will repeat their mistakes.
It mostly is over exaggerated, but to pay attention because at some points your parents are just saying to you what you would like to say to yourself now if you were able to go back in time and warn yourself. Getting this?