Hi.
I'm not very experienced here, nor very old, but I'm in a similar situation. I've spent most of my lunches in my school library and all my friends apart from 1 are completely unaware I'm depressed, same as my parents. All I can tell you is that when I got the courage to tell one of my friends, it felt like I could breathe for the first time in weeks. I'd honesty felt like I was being choked. I use online counselling when I'm really down and alone, maybe that would help you too?
I hope you feel better soon