Though laughter can help with managing stress, it's just one strategy. It's important to reach out to a licensed mental health professional for support if you're facing mental health concerns.
For now, though, go ahead and give it a try. Turn the corners of your mouth up into a smile and then give a laugh, even if it feels a little forced. Once you've had your chuckle, take stock of how you're feeling. Are your muscles a little less tense? Do you feel more relaxed? That may be one of the natural wonders of laughing.