You need to find something that gets out your depression your anger. There are plenty ways out. Find something that you enjoy and persue it. It will help take your mind off things, and it will give you a way out for a little bit. You are letting things gets to you that really have no right to bother you as much as they do. If your friends aren't emailing you, that is their loss. Maybe they are busy or something, but if it is other reasons it is their loss and you can do better than them. You can find friends that will always be there for you, and support you in times of need, as you for them.
Maybe you could get a counselor. Not to make you feel bad or tell you how to live and what to change, just someone that you can talk to and tell them what you are going through. If anything they can give you advice and if they think you are going through depression they can write you a new perscription for an anti-depressent once they know more of what you are going through.
Sometimes the situation is bad. But sometimes you have to change the way you are seeing the situation to make it better because it may not get better unless you do. There are just situation like that and that is life.
If you want to talk further feel free to message me. I am a pharmacist and may be able to help you with different things.