Chewing My Finger?

So, I've been chewing my index finger on my left hand for years. It normally do it when I'm stressed or bored and I don't notice I'm doing it most of the time. Because I've been doing it for so long, layers of skin have built up on my finger making it look swollen and deformed. I've tried cutting into it but it's just skin. It's so bad that I hate showing my hand to people and always end up hiding it. What can I do? I've tried not chewing it for a while but it won't go away!
Chewing My Finger?
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