Hi. According to an online dream website that I visit sometimes:

To dream that someone is shooting you with a gun suggests that you are experiencing some confrontation in your waking life. You may be feeling victimized in some situation. If you dream that someone is shooting you in the back, then it means that you are involved with some questionable people who may be harmful to your well-being. It also implies that you are too trusting of others.

I don't know if that's accurate for you, but maybe it could provide an insight.