Missing Shots?

Yeah, yeah I'm probably just bad, but I'm just gonna ask just in case...

I play on Xbox One and there are times where it seems that I have my crosshair directly on someones chest plate or skull and when i pull the trigger it doesn't register as a hit. Is this happening to others as well or am I just a trash can? Some details: I don't have the greatest internet in the world. I don't lag much if at all in game, but there are times when it can get choppy in the middle of a fight. Perhaps its connection issue? 

Aside from some of the jokes I've made, I'm not a terrible player. I'm also not insane, but I can hold my own in this game whether with friends or randoms, but this issue I'm having seems to happen more often than I'd like. If it's my internet oh well. But if it's my aim well then I'll just have to work towards gitin gud. 

Feel free to help with an answer or accost me with insults. I welcome all.