Hi, Ftus. Sorry to hear about your troubles. I know the feelings all too well. When I was your age, I had very similar thoughts of "when will this just go away?". I waited, waited and waited, and every day when I woke up, it was still there. In fact, I'm 34 and it's still here. There won't be a day when you wake up and you're magically cured. Fortunately, you can improve your fluency, but it won't happen overnight and it takes considerable effort on your part.
If you haven't seen a speech therapist, I recommend going. Even if your mother is not supportive, which is a real shame and I'm sorry to hear that, you might be able to find a resource at your school, as someone else suggested. If you can't see a therapist, I recommend reading a book (such as this one or other online resources.
Basically, you need to teach yourself how to speak again. At first this requires considerable effort and focus, but with practice it will become more natural. The basics are:
Good luck to you, young man, and don't get discouraged. Stuttering will always be a part of who you are, you need to accept it and learn to deal with it the best you can. I'm sure you have a lot of other wonderful qualities that other people would love to have.
edit: if you are interested in the book I mentioned and don't have a way to purchase things online, I would be happy to buy it for you.