I am six letters long.
I am the enemy you carry everyday,
I am the friend you greet every morning and every night.
I am the one that remains stuck in your thoughts,
making you wonder if you speak the language that you think in.
I am the time on your biological clock,
Tick-tocking while every passing opportunity knocks.
I am your protector from the unknown,
I am, quite frankly, all you allow yourself to know.
What am I?
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I am Regret