I've been having this problem for about three years now
Thanks for your question. This looks like gynecomastia and if it is still here at the age of 17, it probably won't go away, but can be easily corrected with a simple surgical procedure. See a Board Certified PS for a consultation.
You would benefit from a consultation with a Board Certified Plastic Surgeon to discuss the Gynecomastia. If you have had it longer than 2 years it is likely not going away. A large percentage of my practice now involves treating young men for this. They are thrilled with their results, which can be seen at 24hrs after surgery and gets better and better as the swelling form surgery resolves. You will have to bring a parent as you are under the age of consent but I would encourage you not to wait too long. The skin retracts much better the younger you are when it is done. This is not covered by most insurance policies. Best Wishes