Absolutely Authentic from A to Z! Jovial

The definition for jovial is cheerful and friendly according to dictionary.com   I find it really hard to be cheerful all of the time, much less to be authentically jovial.  As a teacher there are many days when I feel like my students are doing things on purpose just to frustrate me.  Sometimes they are, and sometimes they are not.  I oftentimes thinking to myself...how do I keep myself cheerful and friendly during those times?  How can I let go of whatever is frustrating me and just work through the situation, and then let it go? 

I feel like being authentically jovial means finding the good things in every situation...because there are always good things.  I think it also means laughing at myself.  Oftentimes when I am finding myself not wanting to be cheerful it is because I am afraid of looking dumb in front of someone else.  Finally I think that being authentically jovial means not taking anything too seriously.  After all when I look back at the moment in question in another 5 or 10 years, is it really going to be that important?  Most likely it probably won't.  So why shouldn't I feel as cheerful as I can, in as many moments of the day as I can? 

What is your view on being authentically jovial?  Do you find cheerfulness and friendliness the same?