You do not havta go, there are seminaries also in england, NY, south africa, and many other places.
But the main idea, i beleive of Seminary is a year to grow with Hashem! Best way to do that is to be in Israel….plus most people go to sem on their own. So if you wanna stay home, who is stopping you?
For most it is a great opurtunity, if you feel that its not for you, then dont go!
What reasons ARE THERE for not wanting to go?!?!??!