Keep yourself more tied up to nice people. Bad/toxic people will aggravate your stuttering.Mean teachers are also a big troublesome for stutterers. If you are facing bad times with unavoidable people like mean teachers or your company managers or toxic colleagues ,it's all temporary, be patient and calm.you can find better environment to your liking ,very soon. We need to focus on only happiness so need to figure out cleverly whom to avoid ,the things to avoid etc.