I have a mole under my right arm and i'm scared i might bleed to death if i cut it should i/should i c a doctor?

Have it removed: I think you already know that you won't bleed to death from cutting this or anything smaller than a major artery. But moles, birthmarks, and such kind of lesions arouse feelings in us that make no sense. You want this off. Removing "moles" is easy for your dr. Go for it. While you're at it, review first aid and learn how to control bleeding with pressure if you do cut yourself badly. Best wishes.