Candida Infection... Help.

For the last 3/4 years (I'm currently 16) I've had a yeast/candida/thrush infection that has not only annoyed and irritated me beyond anything, but refused to go away. I'm gluten free, sugar free and I eat natural yogurt and take probiotics daily. I've tried basically everything from garlic to prescription and over the counter medication... And yet it's still there. It stops me from doing so many things - like going for relationships, wearing the fitted clothing I like (it makes it so uncomfortable), doing intimate things and not only is my mood, eating habits, sleeping routine and life been changed all because of it, I've started to feel depressed. I'm in a family full of depression and I want to be happy and free and be myself but I can't do that when an infection is controlling my life! Please help.