Why do i do this.

I have another bad habit of just chewing things. for example i keep on chewing on ice for NO reason AT ALL and i have no idea why. i would also sometimes randomly chew the plastic of some wrappers without me knowing(unconsciously) and i would sometimes just eat(?) tissue paper or just paper or random stuff. another example are the inedible beads that are in a packet that says, DONOTEAT, in seaweed packets and sometimes lead that are kind of poisonous. i have nooooo idea why i do this and when i ask others, other people say that they dont do this as well. HELPPP another bad habit that i have is the bitting or peeling of my fingers i also do it unconsciously non stop and sometimes my fingers have been bleeding from me peeling my skin.