Honestly, as far as I know, most people who are depressed, in fact almost every single one of them never thing anti-depressants will work. They usually only take it until its forced, and even then a lot don't seem to give it a chance until they realize its actually doing something.
So here's my personal advice: don't let your depression get so bad that you feel all hope is lost beyond a doubt. See a specialist, and be open to the possibilities, if you want to fight it. My mom suffers from chronic depression, and for ten years didn't think it'd do anything until it got so bad she couldn't function. once she took anti depressants it got a lot better.