I share people who you love. My fifth letter is in letter but not in mutt. if you cut off two heads I become what you do to hit some one with a weapon. I can have designes but I might be blank. My second letter is in racing but not in lace. If your you cut my first head and last head I become something you do to break a lock door. My third letter is in blanket but not in brother my fourth letter is in information but not in rational. My first letter is not in same but is in fame Sometime I can show your hard work. I can mean something boring or something that is really important not to do. I rhyme with two words in this riddle. What am I?