How to stop a chewing habit?

when i was younger would always chew on my sleeve, hair (yes my hair ik disgusting), my necklaces (not even plastic they were metal or gold), hair ties LITERALLY EVERYTHING. im nearly 19 but still chew on my sleeves once in a while, if i have fake nails on by the 3rd day i will had already bitten them off and i still chew on everything I chew gum but it makes you bloated and have gas so i try not to chew it. I NEED FUCKING HELP!!!
How to stop a chewing habit?
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