I haven't gone through this exactly, however i've gone through 5 years of depression mainly over the same thing which i just couldn't let go.

I was bullied for years, i left the school and i still just couldn't let go of it even though it wasn't happening anymore i would just want revenge, i felt guilt and just depressed, even a year later i was still feeling that way, everyday. So i think i can relate a bit.

But basically, when i moved school i made a lot of new friends, went out everyday i was so busy and interested in new things i didn't even have time to think of those bullies and stuff, so i was fine but a couple weeks later i started getting these feelings again, not sure why. 

I think you should do something similar, keep you mind occupied from this thing your feeling bad about, join a new club, find a new hobby just anything to mix with new people. I know it's probably very hard for you to, it was with me when people said get a new hobby and mix with people etc. But, if you don't then your only going to feel this way for longer. 

Just find some kind of way to keep your mind occupied.

Months ago when school was still in I was called irritating by someone he even stabbed me with a pencil once, in a class of 10 at my career center one girl didn't like me and isolated me in front of people. This was months ago and I can't get over my feelings, I wake up with a guilty feeling in my heart and I've cried everyday since this all started happening. I'm paranoid and I can't be a playful person. I think I might have some type of anxiety disorder because I feel bad and guilty over the same things every single day even though I'm on summer break, I don't have any friends to talk to so I end up discussing this with my mother and she's tired of hearing about it. At school I don't have friends just people who I talk to occasionally. I don't know if I have a social phobia or what but I don't know what to do anymore. Please help