depression and anxiety in younge people

I'm younge, I'm a teenager and I've known I've had some sort of anxiety since I was younge but recently I've bean sad and when I'm sad I'm really really sad, and I cry and cry and even if I'm around my friends I feel left out and not wanted, I've told one of them but they shared it with the group and everyone said that it's normal, but I didn't go into detail with the fact it makes me die a little on the inside. I think I also have depression, sometimes I think about running away and sometimes when it's really bad how much easier it would be if I wasn't alive, I'm not going to attempt to kill myself and I don't self halm, I want to live and be happy but I'm stuck in a cage surrounded by anxiety and mild depression while everyone else is on the other side having fun and being happy.

I havent told my parents and I tell people quite openly about my anxiety because it isnt something I'm ashamed of, but I wouldn't dare tell my parents because I know they wouldn't understand, I've googled online help and it's all therapy but I can't go without my parents and everyone finding out

Please send any advice to help me