People definitely fear the unknown. Maybe you can start by telling one friend, then see how they react? Personally, all of my friends have been very supportive, and you deserve that! Maybe people are just confused and need to understand what you’re going through on a deeper level.
I used to be really self-conscious about giving myself injections and checking BG in public. At some point though, you just have to remind yourself that it’s your body and your health on the line! If people care and think it’s weird, so be it. You don’t need that kind of negativity in your life anyways! For the most part, I think people are mostly understanding. Once you get more confident in doing “diabetic stuff” in public, I promise it comes suuuuper easily!