I’m really confused someone help

Time Spent- 15m
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This will be quite embarrassing to say.. but here goes nothing....

It doesn’t happen often but at times I have the urge to chew on something like at times I chew the bit of my top but it’s on the collar and it’s quite rare but I usually get food because for no reason I have the strong urge too and also I chew gum quite often. I’m 15 years old and it’s quite embarrassing at this age. Someone explain what’s happening to mee