I went through the same thing when I started college. Honestly stuttering sucks but its who we are, something that I do when I start to stumble a lot is I start talking in gibberish for a few seconds then try again. This helps me when I'm talking to people that know I stutter. When you talk to your teacher say something like you just want to let them know that you a stutter but don't let it bug you. Iv been going to school for a few years and iv met a lot of people that stutter