When you endeavour to do the thing you cannot do, you’re most likely to fail at least a couple of times. Failure is completely normal and it provides valuable information. If, for example, your goal is to become a competent public speaker, because you’ve been held back by performance anxiety, you’re most likely going to flounder a bit when you first begin. And that’s okay. It’s what learning is all about.
If you think about it, failure is probably the worst thing that will happen when you set out to do the thing you cannot do (yet). And when we fail, we might experience embarrassment, disappointment, even shame. This is when many of us give up on our big goals. Who wants to voluntarily feel like dirt? No one. It’s wise to plan ahead on what you’ll do when the powerful urge to save yourself from your wretched state has nearly convinced you to quit.
It may be beneficial to have a support group in place before you set out on your goal. To return to the public speaking example, you might consider attending Toastmasters International to learn presentation skills and practice in a support environment. If you want to tackle addiction, look into Alcoholics Anonymous or similar group. Having allies can be particularly important for individuals who are battling conditions like addiction.
Aside from the fact that you have nothing to lose, think about all that you might gain. Odds are good that you’ll find you’re capable of more than you thought. You will definitely learn something, perhaps that you don’t even like public speaking. Or maybe you’ll discover that you love and excel at writing speeches.
Bottom line: Do that thing you cannot do! You’ll make mistakes, even fail, but you’ll probably meet a new friend or two along the way. There’s nothing to lose.