Is it normal i'm freaked out and repulsed by diseases?

I'm in my teens and as long as I can remember I've been really scared and disgusted with people who have the flu, or any kind of virus that is contagious. I usually spray some antiseptic or something alike if someone with flu walked past or touched my stuff. I wished everyone with a contagious disease would stop interacting with others and be self aware that they need to recover. Personally, when I get ill I don't go out and throw mi tissues in the bin, and do many things to avoid it spreading to others. I don't have the best immune system so I guess that's another reason of why I'm repulsed by flus and such.
Does this happen to anyone else?