May I be allowed acess to the information on why you physically can not stop being catholic?
And at least according to
http://en.wiktionary.org/wiki/despair
Despair is in general a state of hopelessness. Both our interpretations are partially correct, while I admit that you might actually have used it better.
However, I would like to point out to you that while you may be in control of your emotions quite well, many people are not.
For a lot of people, life is just very bad. Due to them not believing in god, they may have no hope of better times in an afterlife and without a bright future in the material world being likely, they may just give up all hope. Those people are in a very bad situation. Your mentality is essentially telling these people, who have no hope, but not enough control over their feelings that not having hope was ever a concious decision, that they should "stop being so miserable". That would not be helping those people. For them, that is litterally the same as if you told a poor guy to "get some money". Think about that.