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Live, Laugh, Love is one of my favorites (original, I know)
I also really like "Life's too short to rain to stop, you've got to learn to dance in the rain"
Forum user Abnegation told me a while ago to "stop thinking too much and just go with the flow" roughly quoted, and I have been a happier person since following that advice.
"Life's too long to not do what you want to" was a nice subversion of the cliché that really stuck with me because it's actually more frightening than life being too short: the idea that if you don't do it (whatever that may be) when you have the chance, you'll have to live with that regret for the rest of your life to regret is far scarier than running out of time, at least for me.