I second this. I tried yoga and running and meditation and therapy and... and... for YEARS. Like you, Annette, my mom kept at me to take anti-depressants, and I kept (angrily) telling her I take plenty of stuff already, thanks. I wanted to find a "natural" solution, and to know that I was strong enough to figure it out without pills. At about your age, though, I went to see a therapist who recommended a low dose of an anti-depressant, and when I said no he told me this: "our states of mind are practiced, and those of us who have something dragging us down every day unwittingly practice that down state of mind, until our brains no longer know how to do anything else. Anti-depressants, for some of us, can break that cycle of practicing what we don't want". This convinced me to give it a try, and I can't tell you how glad I am that I did.
Natalie is right (below). They don't make you happy. They the ability to feel happy, which sometimes just is not possible otherwise. Good luck, Annette. This stuff's so hard.