Dont worry. I am faced same prob in my college days. Not able to tell my attendance in class every morning. Then went to the teacher and asked him to look at me when I raise my hand. I skipped few group discussion phases before interviews and lost those job offers. Study well and acquire a strong knowledge/skill in your career path and tell yourself that no asshole can challenge my brilliance. Be stubborn. Always say "Come on ,you are better than any of these idiots". Always be with people who smile/nicer ones ,remove the toxic friends ,toxic relatives from your life. Try to reduce your masterburation if you are doing it as it increases the stress and build up pressure in lungs so it takes talking little difficult. This stammering prob ,reduces only if you are happy /relaxed and confident/stubborn mindset and don't care for this stutter. I talk a lot of bad words to keep myself confident all the time. Ignore this stutter and keep focusing on your happiness on your life like having nice girl friend,laughing, nature loving, observe the small kids playing in park and smile. Stuttering can affect some career track eg. I'm a software programmer ,I hardly talk with others in team And I do my work and get out of office relax with my kids.I know a manger kind of job is not suitable for us as it may stress. So I chosen my job for my liking and now I'm going to be 40 years old. Stuttering prob gradually deceased from severe level to mild level. I don't socialize much, I keep a very small friends circle and happy living independent life. I went for treatment at 23 ,it worked temporarily for 6 months .I was practicing deep breath technique, blowing bubbles in a glass of water, blowing away the torned papers.its all temporary. permanent solution or complete recovery isn't possible. Always keep self motivated ,though your parents don't motivate much. You are a beautiful ❤️, champion , always better than others , very kindful and happy person.