and that's the problem friend..
You're doing exactly what anxiety wants you to do, hide and conceal it from others, yet that takes so much energy from you and it becomes even more deeply rooted in your mind.
I was forced to raise two daughters on my own, and a huge part of actually being a parent was to be overly observant too. I knew I had to try to help them cope with situations.
You're expending so much effort in keeping it hidden away from others, for whatever reasons, and that is the first thing that needs to change too. Open up to your parents about it ALL.
Ask them to help you, seek out medical assistance, seek out a therapist or councilor, talk about it OPENLY...
That's how you defeat it, control it, manage it, learn to cope with it, deal with it.
Life is very challenging already and at such a young age, its time to make that effort as only you can.
There's my thoughts.
Wishing you new found success!
Enduronman