Your niece dying before she was born. Your friend replaced you with another girl so you lost you friends. Your family didn't have time for you. You were always alone. You had to be strong and hold in your feelings so you could help others. You have held your feelings back your whole life.
Most Helpful Guy
I think I would get depressed.
That said there's no reason that any of that has to "break" you. You'd be surprised how strong you can be and there's no reason why you can't move on from everything you said.
Regarding your anxiety, I know how you feel. It makes everything a little harder to deal with. I take two anti depressants each morning and my doctor has raised the dose 3 times so maybe I'm not the best source of a cheerful speech but I can promise you that it does get better and that you CAN move on from this.
15 is still incredibly young.0