OMG I FORGOT A FRIENDS BIRTHDAY!!!!!!!!! Ugh!!!!! Am I a bad friend?

I am such a terrible friend! I know I have been busy with school and work and other things in life but I just realized right now that last week was my friends birthday!!!! Ugh!!!! I cannot believe i forgotten about her birthday!!!!!!! I’m surprise she didn’t call me up and yelled at me for forgetting. WHY DID I FORGET???!!! Why why why? It has never happened before and I always remember birthday!!!!!! Why don’t anybody let people know it’s their birthday anymore?! I am such a horrible friend!!!!!! She’s not my best friend but I feel so terrible for forgetting!!!!! I Gotta make it up to her.