Biting the cheek

[SirPsycho69]

When I'm stressed or bored I often bite the inside lining of my cheek, does anyone do the same?

[clueless2]

Does it bother you?

People do all sort of things when they're bored or anxious.
Some people pull out their hair, some people bite their nails, pick on scabs, etc.

Unless it causes actual bodily harm (like drawing blood in your case) or disrupts your lifestyle, there's nothing "abnormal" about it.