I am the same, I’m constantly suppressing laughter just thinking about things people have said or dreaming up a silly scenario. I’m literally laughing at something I just remembered AS I TYPE THIS.
And I genuinely find stuff people say on the internet funny. If I share it, then chances are I am giggling IRL. I could never sneak a look at this forum while at work, even, because my colleague (also a giggler) would be like “oi, i hear you giggling over there!”
I’m really glad I laugh so much and so often, although it has its downsides - like getting in trouble, and when I was first diagnosed with depression at school the teachers didn’t believe me or my parents because all they could see was this super happy, bubbly girl laughing and joking all the time.