It's a birth defect. Is it possible to rectify autism or ADHD ?? No right. Same way. This stuttering needs enormous support from family members, stubborn confidence in yourself and as you age more and more ,you will forget this totally and happiness comes from later 30s as you are settled in job and having a family. Til that time, tell this shit frankly to school teachers ,college lecturers and your colleagues and have this defect accepting mentality.