It gets better. I was same as you at your age and I felt miserable. But now that I am 21, it got much better. I still stutter, but I have more positive attitude about it. Just embrace your fear, talk to people anyway, talk in front of people, don't avoid those situations because if you give up to fear and shame it will never get better. I tried to open myself and sure, it's hard at the beginning but it gets easier and I am not bothered by it as much as I used to.