Do I have to stand and say the pledge of allegiance ? Also a patriotism question?

you do not have to do anything, but you should let the other folks around you do their self imposed "duty". Ther eis no laws forcing you to do it....and it sounds as if your teacher is a Superpatriot....Buy the book Superpatriot it is only 150 pages, but it will help you see what being a patriot really is rather than simply waving a flag around so others can see it.