I'm 16 And Have Been To My Gynecologist Many Times

I'm 16 and have been to my gynecologist Many times for two years. I've been checked for any sexual transmitted diesese, which I don't have any. I go to the doctor for my problem, they say they find a little bit of yeast, they give me pills, I take them, and the symptoms go away while taking the pills, but come right back when I'm done Every time. So therefor, it's like my vagina is never getting a break, making me so depressed. My symptoms include itchy, burning, and smell constantly .It's not a bad smell.. But it's not something I won't anyone to smell. It's so strong I smell it by just sitting down, or if I touch my pants down there I can smell it on my hand. Also they said one time I had BV. And I got medicine for it, but symptoms still came back. Please help me. I don't know what is wrong.