I want to become a foreign language interperter. Where do I begin?

I am not a foreign language interpreter, nor am I planning to become one. I think you can major in any of the languages, and maybe study and/or major in psychology or international relations, depending on what field you want to be in. A better idea would be to tell your advisor(s) your interest in becoming a foreign language interpreter, and follow his/her/their advice regarding what courses to take and what majors to select.