Yes, in my opinion you don't need to tell your parents, but you need to tell an adult. We have been walking on this earth a little longer and some of us know a bit, quite a bit about what you might be going through. Your mission now is to find an adult who you trust or someone who you don't mind telling this about, with 6 billion people on this earth you shouldn't have a problem.
As for you being depressed, yeah you might be, we all get depressed sometimes, but I will tell you something. Yourself, your body, your mind... you are not built to be in that state. Our natural state is HAPPY-NESS!
Try smiling for 10 minutes, even if you fake it you will feel much better, and won't be able to fake it much longer. Your will start to feel it!
Your emotions are wise, they are telling you something, listen to what they are saying and you will find what you need to do, but an adult will definately help you see all this. Go for it and let us know.
If you want you can send me a personal message. Have a nice day