Oh god, this is so freakishly familiar. I know this is a serious trouble when you are in the middle of it, I can't help it, but looking back at my own story I can't help but shake my head and laugh in relief.
The redflag for future inner stress is really when one sits too long in their own narrative soup without inviting others from time to time to add main ingredients as well. It's really what
@John K says here that did the trick for me as well and I just realized how Fe that actually was.
So, our stories are not exactly the same since we are different people and other people and circumstances are involved, but there are a couple things from my story someone could perhaps gain from seeking valuable feedback:
- most people do not dare to approach you to either compliment you or ask you about a presentation topic in more depth even when they are very intrigued. That can have various reasons like not wanting to stand out from their peer or not wanting to look stupid for not understanding everything or lame for being interested in a(n unusual) topic
- some people just make funny faces when they are just hyper-focused and concentrated or when they are surprised in some way
- you might be a much better presenter than you think or see yourself. It doesn't need to be showman quality, although even that can be enhanced and it can happen automatically when you've made the topic your own, something like.. "charisma by interest in a topic". It could be that you are simply capable of turning a seemingly boring topic into life-lesson quality and into a deep enriching meal for others, something that needs a lot more attention than "meanwhile talking casually to others" would provide.
- there might be a lot more self-confidence within you that is just waiting patiently to be allowed to grow stronger

and
- also some tricks how to deliver your thoughts in a way that makes it easier for your fellow students to come along. (Actually, the theory of cognitive functions provide alot of exciting material on this, too.)
In rare occasions, especially when people are a bit more mature, someone will walk to you and share their thoughts, questions and joy arising from all this, which is basically a wonderful treassure, but most people just won't because they find a million little reasons why they might not want to bother you. It's up to you. - This happened to lucky me because a very bold guy was a little late to the class and a curious soul. My presentation on a staircase art installation turned into a wonderous journey about the Greek and growth and what not. lol It helped me realize that my presentations are a little different, and it helped me embrace it. Now I enjoy it even, because I know some people have a good time with it. (But don't get me wrong, on a bad day, insecurtities can still strike of course. But anyway it is definitely easier when you are already in the "presentation mindset" when people are looking like that, than when you are not presenting but in a daily situation and it happens.)
To me asking for feedback can often feel like jumping into cold water but it can also quickly disarm insecurities very nicely. Especially when you know yourself so well that you are very aware of the consequences if you don't do it. To me the trick is to ask the right person you feel most comfortable with in the beginning.

Perhaps someone who is also a bit insecure and sitting next to you or a friend in the becoming? Who knows
End of embarassing showcase. I just really really hope you find your own path that takes this also to a much much lighter place~! <3