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. You can choose to act, and you can choose to be happy.
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.