Help...

Help... So this is the situation. I can speak perfectly fine at home in front of my family and barely stutter. But, when I am in social situations with strangers, my stutter comes up. Also, when I'm giving presentations at school, my stutter comes up again. My stutter has been diagnosed as moderate by my speech therapist. I am trying everything in my ability now to relieve my stutter. Does anyone have any tips to help me overcome this stutter for good? I really don't want it to block the opportunities I have in life, such as meeting new people, public speaking, etc.