Long Riddle But Easy One

Riddle: I share people who I love. My fifth letter is in letter but not in mutt. if you cut off two heads I become what you do to hit someone with a weapon. I can have designs but I might be blank. My second letter is in racing but not in lace. If you cut my first head and last head I become something you do to break a locked 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 Sometimes 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?