its not that bad. i used to chew my own skin on my fingers and thumbs and its more of like a tick. it gives a sense of comfort and how you can power through it is like maybe put something very bitter on the skin and is safe for the skin ofc to take away that tick. I hope this helps :)
Hm... maybe gum then?
If not, then I don't think there's anything terribly wrong with chewing on the tips of your fingers, I do it every now and then. Just don't do it around girls lol