Listen, I'm not saying you should walk around like a robot 24/7 with a shit eating grin plastered on your face, but I'm also saying... you're probably worrying way more than you need to be.
F*ck it (or die trying).
Learn the "subtle art of not giving a f*ck" and you'll have a master's degree in life. "Still Haven't Found Any" is for all the people that have that degree, as well as those that are striving to learn.