Of course I'm yearning for what I can't have. Why would I yearn for something I can have? If I can have it there would be no point yearning, I'd just have it.
Yearning for the impossible is what makes us humans great. Without crazy, hopeless yearning there would be no great achievements, no great loves, no great works.
So what if it is impossible? Yearn, strive, give it the old college try knowing you will fail, try anyway.
One day the river will run dry and you will walk across it, one day she will wake up knowing she loves you, one day you will look back at the impossible and laugh.
Of course I'm yearning for what I can't have.