I want to show my potential but stuttering kills me

I want to show my potential but stuttering kills me Hi! I didn't have a stuttering until i turned 16. This thing came up with bullying at highschool and my doctor's said "you have social phobia.". I'm 20 today, my anxiety is getting worse. My speech is not fluent, i stutter a lot. When I start speaking in public, my heart rate goes out of my control and I start to stutter. I can't say what i thought. I replace the words in my sentences that are easier to say. I cannot show my potential to anyone. Nobody believes what I can do. I sick of this. I don't wanna live that way. I hate my social anxiety. I hate my life. I don't know what to do. It's really hurts. I want to say what i thought. I don't wanna have to change any words in my sentences. I wanna show my potential. I'm 20, i'm mechanical engineering student and i'm stutter. If you have any suggestions to me, please help. Ps English is my second language. So if i did mistake, sorry about that.