My seventeen-year-old son had the same food issues when he was little. We did go to feeding therapy and it was very helpful. What they did was encourage him to smell one food at a time. If it smelled okay then he was encouraged to lick it. If that went well he would take a bite if he wanted to. This process really helped him try new foods. I would also let him pick out five new foods each week when we were grocery shopping, we repeated the process at home. Now my son eats all kinds of foods and isn't opposed to trying new ones. Good luck.