Guys, Do you like girls that are cheerful and smiling a lot? or is it a turn off?

I am very cheerful person, I smile and laugh a lot , I like to joke - I just can't be very serious person. Even when I am working, in the office.
But I am 25 years old, and I wonder if men would find me immature because of this? is this a turn off or do you like it?
Guys, Do you like girls that are cheerful and smiling a lot? or is it a turn off?
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