I can't do this anymore

I can't do this anymore I did not have this problem when I was a child. As I grew up, I started to develop very bad stuttering, and today it's as bad as it was 5 years ago. I can speak fluently when I'm alone; well, mostly. But this is getting worse in front of others. It's really humiliating how some people mock me and laugh at me. I'm good at studies, so that's a strength I use to fight these mockers. But I can't do this anymore. I can't. Life is really hard for me. Really hard. No one understands my pain, not even my family. My family thinks this is some sort of problem I can control, and they try to encourage me to speak fluently while I'm stuttering, which does not help at all. It's really not helping. My parents are concerned, and I appreciate that, but they think I'm in control of this. They encourage me to overcome stuttering. Once, about a year ago, I could speak extremely fluently (1 in 15 words got stuck mildly, I'd guess), I don't know how I did that, really. Seeing this, my family felt as if I'm in control, which I'm not. I'm really sad about this, and it's extremely frustrating. What do I do to overcome this curse? Help me guys.