Challenging times can be... well, challenging... and can drive even the most strong - hearted to give up. But, even in these dark times, make sure that you have one goal; shine through the darkness!
Think of it like the light shining through the dark clouds. Dark clouds carry stormy, tough times but the sun always seems to shine through; this sunlight that carries such hope and bright "alive-ness". Yet, the light seems to have no "substance" to it; we can feel it hot on our faces but we cannot touch it or taste it - it's just... there. Think of that as you; even if you feel like you have no substance or place... or like you're just "there"... you can still shine through!
Just like the sunlight shining through, breaking up the darkness to reach Earth, you can break through the darkness surrounding you and brighten your life!