'Statistically significant' refers to a specific criterion of falsifiability that doesn't apply to your statement as phrased. You could invent a metric to make your claim more easily falsifiable: for example, "My happiness measured on a scale of 1-10 will decrease if I drink X amount of alcohol per day" is a testable claim, and having tested it, you could examine the results for statistical significance. But just adding the word 'statistical' to your sentence doesn't make it a quantitatively falsifiable claim.