I faced the exact situation when i turned 16 and It went like this for 2 Years , one of the worst period of my life . I didn't want to live this horrible life but then it changed and it is slowly getting better . Now i'm starting to love myself. I found the purpose of life , i'm pushing myself harder on situations where i can stutter , i read hundreds of books and Different religions and Atheism to find the actual truth and i recently reverted to Islam . I genuinely love myself and am happy in life , . I recommend you to read books out loud and increase your knowledge and Do Diaphragmatic Breathing exercises Daily after Waking up in the morning. Learn different conversation tactics and learn techniques like Word stretching and Talk on Exhale and so many more . Now i'm turning 19 in june , so don't feel hopeless and tell yourself everyday that you can Do this . Do positive Self Talk daily whenever you think low of yourself and tell yourself that you are getting better and better at speaking. Sorry in advance for my Bad English.