"Having a panic attack? Stop it." - Ima try this next panic attack, thanks for the advice!

i have a few.
"Never give up. every improvement, no mater how small is another step towards success."

(a patriotic one) "nothing is impossible if you put your mind to it, its Ameri-CAN not Ameri-CAN'T."

"do not be discouraged by imperfection, perfect is an impossible goal."

"i may be weird, but at least I'm not boring!"

"be yourself! because if you don't, who will?"

(a patriotic one) "nothing is impossible if you put your mind to it, its Ameri-CAN not Ameri-CAN'T." - Repurposing to because I'm not from the states, it's CAN-ada, not CAN'T-ada!

 "It's that all it takes is one bad day and you'd be just like me."
Scourge line from sonic Archie comic inspired by joker

As for original hmm
Who you are doesn't decide what you wanna be

"Who you are doesn't decide what you wanna be" - Well I wanna be motivated as heck, thanks!

"Don't be shy, you can't really go wrong." - Some Stinky Lizard

"Don't be shy, you can't really go wrong." - Hey, I'm not that stinky...

When life gives you onions, make onion-ade!

When life's an ass, fuck it.

Every corpse on Everest was once an extremely-motivated person.

When life feels like it can't get any worse, remember that you could also have diarrhea.

"When life feels like it can't get any worse, remember that you could also have diarrhea." - What if my problem is an endless stream of diarrhea?

Hmmmm (Sound warning)

"Been there, done that, got the promotion"

I fell backwards xD

"No, money and success won't cure my depression, but at least then I can be depressed on a yacht!"

"In war, every shot you hold back is already headed right for you."

"You can't improve the past. You can only improve yourself for the future."

"You can't improve the past. You can only improve yourself for the future." - story of my life, thanks!

Late to the party, but here's one.

If you wouldn't go to someone for advice, don't take their criticism either.

"If you wouldn't go to someone for advice, don't take their criticism either. " - I've got one last spot for something motivational on my board, and I think this is a perfect fit! Thank you, I'll be keeping this in mind when I eventually get constructive criticism!

Glad this helped! Good luck on the next rendition of Prehistoric Encounters.