Hello Nadia R, hi and thanks for posting your comment.
I am deeply sorry for not only how you feel but for the other problems you are facing and it must be disappointing your best friend hasn't confided in you about her grandmother, but sometimes at this age some people don't know how to talk with others because they are too upset.
If you are asking yourself whether or not you do have depression and/or anxiety is a question you might not be able to answer, and convincing your parents to take you to the doctor can be frightening because you aren't sure of their reaction, however, can I offer a suggestion, you could tell them that you feel you might have a problem with a personal matter and only want to ask your doctor at the moment, as it's private.
Doing this seems to be a good excuse to see them and once you are in their office, tell them exactly how you feel, or alternatively write down how you are feeling on some paper and have it tucked away in your pocket, so no one else knows, then give it to the doctor and on the list tell them how your parents would feel if you told them.
They pay more attention to what a doctor has to say.
If you can ask the doctor that you want to talk with them by yourself, because it's a private matter.
You can also contact Kids Helpline 1800 55 1800 by phone, web chat, or online and talking with these counsellors, which you may also find very helpful.
Please do not be afraid, your health is of prime concern.
Hope you can get back to us,because we want to help you as much as possible.