It makes me sad to read this.
I honestly didn't feel as bad when I started as many new grads seem to feel now; things have changed. Sure, I was as nervous as the next person, but I felt that people were pulling for me on an almost personal/individual level. It wasn't about how fast I could get up to speed; it seemed like someone out there really truly wanted us newer nurses to become good...great...excellent nurses.
So - - #1: There are many here (I hope) who are pulling for you, in spirit.
#2 - I agree with the above; take some time to just breathe...just "be." Try as hard as you can, emotionally, to not let yourself panic about your potential to succeed here. These are the times in life where you get through by putting one foot in front of the other. You have to take care of yourself. Be really good to yourself. I am here to tell you that the things being used to measure your work-worth are not legitimate. So don't make the mistake of judging yourself by that type of yardstick.
#3 - There are any number of suggestions or solutions we might suggest (keeping a journal of your progress, finding a mentor, etc.) but I believe for right now you need to: Not panic, put one foot in front of the other, and take good care of yourself.
If you believe you might have underlying anxiety or depression that preceded this new stressor, or if you have any other health concerns, I would work with your PCP to optimize these.
A big ((hug)) for you. I think it will be okay, but I know it can sound trite for others to say that.