The fact is that not all lies are bad, and there really is a time to lie. I'd even go so far as to say that a little lying can be healthy. As Lord Byron once said, "What is a lie? 'Tis but the truth in masquerade."
Tines of solitude, chosen or enforced, can be embraced to reflect, to nurture your spirit, to meditate, contemplate, pray and get in touch with a deeper aspect of yourself.
Your fears are uniquely yours and yours alone (I'm not sure if that's good news or bad) and there are thousands of possibilities of what you might be afraid of.