I’m only 17 but I’ve gone through this issue multiple times. For me personally, I thought to myself “if that was someone else who stuttered instead of me while presenting, would I keep thinking or caring about it after a couple of days?” and the answer is NO. people forget what happened after a couple of days and to be fair no one cares or remembered that you stuttered after 8 years for your case. I promise you man no one even cares that you stuttered. Everyone at one point messes up a presentation so badly that they keep on thinking about it for years so you aren’t alone