embarrassing period.. help?

[hi]

I didn't know that my period was going to come today and it was more than a week early so i didn't wear a pad or anything.. i noticed that something was weird around 7th period but i still didn't think it was my period.. i didn't use the bathroom or anything. i walked around like everything was normal.. then i got home and saw this HUGE stain on the back of my pants.. so i walked around school with a huge ass period stain on the back of my pants and i walked home from school too so i walked past a bunch of cars.... i seriously want to kill myself right now. what makes it worse is that i have social anxiety and i don't think i'm ever going to get over this. i feel like people are posting all about it on social networking sites like fb, twitter instagram.. i know that tons of people saw.. i also had to walk in front of the class to turn a test in..oh my god.. please help i don't know how to get over this? can someone atrempt to make me feel better or something