As others have said if you want to save on living costs come south. In Hualien I eat out every day along with paying for the gf, travel, and spend under 10,000 TWD / month. (Dormitory is just 7000 TWD for 3 months.) My more frugal Indonesian friend spends under 4000 TWD / month and sends the rest of the scholarship money home to family.
Also, wanted to say I’m impressed you have this goal. At your age I couldn’t see beyond university and took me another 7 years to try something like this.