Welcome Im 14 so I get what its like to be that age with fear. Look, this phobia sucks and I promise you it can and will get worse. Id say tell a school leader or your head of year if you have that. Tell someone who can get you free therapy. I know therapy sounds scary and no one has to know but if I had caught my phobia in its weaker stages, I wouldnt be on this forum thats for sure.

Good luck!