I’ve been a type on diabetic for almost three years and I can relate to what you’re going through. Unlike you, my favorite place to inject myself is not in my arms. That’s probably my least favorite place, lol! I tend to give myself injections in my thighs and buttocks. Repeated injection site use will cause bruising. Maybe you could try switching sites? Something that helped me was getting a tan. I have a somewhat tan complexion but when I noticed that I was bruising more easily, I decided to use some spray tan (cuz I’m against tanning beds) to lessen the appearance of my bruises and it really helped! Now I can cover it up just like I would a blemish on my face. Don’t ever feel bad about your bruises though. They show your strength! Also, if you’re ever feeling down, talk to someone (even me) you’re not alone!