I had this dream the other night, we had a blackout that night, and I was a little paranoid about it, but I woke up so scared, I couldn't fall back asleep and I am almost a little worried to go back to sleep.
I get paranoid about almost everything, and everything scares me most of the time, or I assume the worst in everything. But I never tell anyone my inrational fears for the fear of sounding stupid.
Which 99% of the time it is.

But in this dream I was in a zellers, and I was told to go with someone where I changed and was trying to be someone else, and me and my current boyfriend were locked in my bathroom suddenly, and there was someone trying to break in, I thought maybe they were after the person I was looking like, but I wasn't sure so I kept them from coming in, and then just before I woke up they said it was my last warning, or last chance, I can't fully remember, but I have had this nightmare in my mind eversince and I'm terrified to go back to sleep, for the fear of finding out what could happen.
I know it sounds extreamly stupid, but could I get serioasly hurt? From my dream?

Dreams are our subconscious at work. We usually dream about things that we extremely enjoy or fear. Or what is deeply suppress inside our spirit. Yet, dreams are just dreams and only appear real depending on what level of sleep we are in. You have already admitted you worry a lot. In my opinion, since you mentioned that you and your boyfriend were locked in a room and someone was trying to to get in. Reads like an insecure relationship and being uncomfortable being yourself around him or others. You are afraid someone will come between you and them. You are avoiding every situation that threatens the relationship but if feels like someone will find out how you really feel and what you trying to hide from them. Confidence.. is all you need to move on from this fear. Stand up to your feelings. After all this is your life and you are really the one in control not how you feel. Fear is FALSE EVIDENCE APPEARING REAL.