Plz tell me I'm not the only one..

I feel like a terrible mother! My daughter has been crying most of today and I need a BREAK!! I just put her in the crib, walked out of the room and shut the door. I don't know what else to do for her and she won't stop crying. Ugh I feel like the worst mother ever right now! I want to cry myself!! I have literally tried everything even talked to the pediatrician!