I have only one true motto in my life: Don’t fret, act. It stems from Buddhism, actually, but is more directed than just saying “stuff happens, and you can’t change that”.
To every worrying, anxious, sad, fretful person out there. I care, but I feel no sadness for you because you have chosen that path.
I’m often reminded of the great Rush (Freewill) lyric: If you choose not to decide, you still have made a choice.
Fretting is choosing not to act and it’s incredibly useless as a tactic.
As Yoda says: Do or do not. There is no try.
Don’t wait for luck. Make your luck.