Trying to get things that you can't obtain is not only harmful to you but also a waste of resource. The worst of all, I think, it's that it consumes a great deal of the credits on yourself and in the end you don't even trust yourself anymore.
So, why trying in vain?
Believe in the reality, don't believe in yourself.
Whether physically or spiritually, when you know it's not possible, don't try.
Of course all these are based on the premise that you know yourself well enough as well as the conditions and stuffs.
It's important.