Jigneshbharati Is the first one imperative? They are both imperatives (as is "don't worry"). The second sentence needs punctuation, however.
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JigneshbharatiIs the first one imperative?
They are both imperatives (as is "don't worry"). The second sentence needs punctuation, however. Many people would probably be satisfied with a comma:
Don't worry, be happy.
Strictly speaking it is a comma splice, but a benign one that would probably be widely tolerated.