How do I overcome stuttering blocks?

How do I overcome stuttering blocks? I've been stuttering ever since I can remember, I'm 15 now and it seems to progressing and worsening, not so much with mumbling or stammering (sttt-,hooo-) but the most embarrassing uncontrolable blocks (moments in my speech where I involuntarily pause, I feel almost paralyzed and can't say my next word) even when I try to speak slowly 😭😭. It's so embarrassing and annoying to deal with and I feel almost powerless, during these blocks I end up LOOKING AWAY, FREEZING WITH A WIDE OPEN MOUTH, OR HITTING MYSELF TO TRY FORCE the word out which is not effective and embarassing. I've tried speech therapy (back when I was much younger and then the whole last year, the improvements were minimal) I really wish there was way to overcome this. I don't stutter or block at all when I talk to myself alone or to the mirror, sing etc. is there a way to unlock this when in public, it's weird because I consider myself a confident social guy yet I still stutter around people who are close to me. When I block it's hard to "RELAX" "SPEAK SLOW" or "CALM DOWN" The blocks are really starting to stress and depress me more than they should, which I think is contributing to the progression. Im praying that if I deal with it at my age that's it's possible to improve it significantly like those speech stories🙏. Please can someone give me an effective (not typical: "RELAX" "SPEAK SLOW") tip help me improve my stuttering and blocks and way to implement practice over long-term or daily. I really need help :(