Hey, just wanted to say that I relate to your post a lot. First of all, people making this sort of comments are simply impolite and ignorant, I've come to the conclusion it's best to just ignore them and focus on your progress. Which sounds amazing on your part! Progress is not a linear thing, so just celebrate and concentrate on your achievements, how ever small they might seem at first.
I feel like the more effort you put into it, the better results you get.
I've also been this awkward, too silent type in my undergrad time, but presenting came more easily because I just wore this self-confident mask for a certain amount of time. I'm not sure this will work for you, but you can try to practice some power poses before your speech or presentation to set the mood, and then just fake it from there, no other way around it. ? I've recently watched Ted Talk by Maisie Williams and as confident as she seems, she still had her hands shaking slightly throughout the whole thing.
So yeah, we're not alone in this, and good luck to you in your progress!