I deduce I am developing a double chin....?

I'm 15 and I think I am characteristics of getting a double chin. (I'm not obese or anything.) I do laugh an awful lot....could that be why? Anyways, how can I tighten the skin below my chin?
Answers:

I was told i enjoy a -slightly- retroflexed uterus, what does this mean?

Um, conceivably you could do neck-clenching exercises... uhherrrr

It's probably not because you laugh--that's face exercise. anyway if you're not achievement weight afterwards this is probably just genetic and your chin is supposed to look resembling that.
It's not a double chin so quit worrying about it and delight in life because you're a pubescent and you're not allowed to verbs about your chin until you're in your 40s.

Just maintain laughing! :D :D :D like that.

I only just started swimming hard again and my spell got nature of irregular. It went away and do you reckon it will

Everyone has a double chin if they're a full-bodied weight. It purely depends on how you move your face backbone. No worries, you're fine nothing you can do will metamorphose it