You can only control what goes in not what comes out. This applies to almost everything.
A person may not react how you expected them to when you do or say something.
A recipe may not turn out the way you expected even though you followed the instructions.
A party you planned may turn out different than you expected.
A project you started doesn’t work out how you thought it would.
Even though deep down we know this to be true about so many things we still expect certain outcomes and are disappointed when they don’t happen. Continuing to staying attached to outcomes will only cause you to be stressed, anxious and less happy.
Not wanting an outcome is not the right answer, because as humans we are wired to seek outcomes. However recognizing the desire to want to control all outcomes is a great first step.