Certainly they can read it. Even if you do not believe in the psychic stuff, there is plenty of posture, tone, and word framework
to consider.
Check out Neurolinguisics. the tribe on this subject does not post for the beginner, so a book or a read from the net may help.
I think your words are pretty clear, but some self programming about making intentional communications may help.

Have you considered acting classes? No, I'm not kidding. Even if you can squeeze one class in from a community college, that might help. You'll get feedback on your presentations, you'll get helpful criticisms that you don't have to take personally. The instructor is only trying to get you to show more or less emotion of some kind, talk louder or softer, use more or less body languages, and they are willing to help you to accomplish that.

In addition, a public speaking class, Speech, would be great. You could even do as your project, a workup of a speech that you might make to a group of potential customers (and, actually, they ARE potential customers, LOL, just might not have the money for it right now being students).

Again, you'll get feedback from an instructor who's seen hundreds or thousands of presentations from all levels. You get insta-feedback from the looks on the other students faces, again with it not being a personal attack or rejection of your product or service. They're students and you practically have to set off firecrackers or say something incredibly interesting to keep their attention.

Often these classes can be had for $20.00 a unit or so. So maybe $60.00 for one of the classes, plus books (which are the killer). But if you put that into perspective, it's way less than some professional seminars. You get a lot out of it, because you go for a semester, not an afternoon.

You also can take notes on the other students, and what things drive YOU nuts. Do they stare? Is there some kind of incongruity because they're talking about love and they are wearing a shirt with a skull on it. Do they have such an engaging way about them that even a speech on the origin of modern toe-nail clippers sounds fascinating? What is it that MAKES them engaging?

Yeah, you do end up around people. But you want to sell to people, and you have to find ways to do it. In addition, you may find someone who could help with creating a presentation, so that their engaging style is part of what you use for selling your product/service.

Bonus, you could end up with a lot of business. I know that as a student, I was broke. But parents sometimes have more money. And there's a possibility that you could create "College Days" themes for your service. That combine all those pictures the kids took during their college years, culminating in their graduation. That's a whole new market, and there are gazillions of students. A lot more fun than a scrapbook or photo album!