Stuttering in Highschool need help

Stuttering in Highschool need help So im going into Sophmore year of high school and i stutter. I can talk normally when im hanging with my friends and go who nights without stuttering once. But when it comes to reading or presenting outloud or talking to someone important, i stutter. I used to stutter a lot and i can tell it keeps on getting better. But times freshman year i had to present and choked in front of everyone has made me depressed. Even now i have flashbacks to me choking and it makes my breathing hard and ect. I could really use some advice. Thanks.