Go to your doctor. He/ she will help you with your depression by referring you to a good counselor who will listen, understand, and keep things confidential- in addition to prescribing medication for a time which will help.
When you feel a bit better, you'll be able to go out with friends and take up hobbies you like such as reading or walking or music; whatever you like which will help take your mind off things.
Also talk to your mom or a nice friend who will understand and keep a journal. It's important to eat and sleep well and get exercise. Music is also therapeutic.
The best thing you can do for yourself today though is go to the doctor for help with depression, so please don't delay. Good luck. Once you get help and talk to a professional, you will feel SO much better. This too shall pass.