Sleep paralysis

I opened my eyes to see my ordinary room, the door into my moms room and the mirror on the wall.
I felt paralyzed, I tried to wiggle my toes and clench my fist but I wouldn't work.
I knew it was the typical sleep paralysis.
I tried to close my eyes but as soon as I shut them the flew open and I looked into the mirror.
I saw myself and I realized that I was sitting straight up in my bed.
I looked into my own eyes and felt someone or something grabbing my hips.
I tried to see what/who it was but my eyes wouldn't move.
It was like they were stuck, i looked myself in my own eyes for god knows how long.
I felt the hand(?) travel up my hips over my arms and to my neck.
They rested on my neck for quite some time before the thing dug their nails into my skin.
I was trying to clench my fists, wiggle my toes or move my eyes.
All I saw was the terror in my eyes. I've never seen someone so scared, so terrified...

I finally got my eyes to close.

But I couldn't wake up.

I still felt the hands on my neck, no longer digging their nails into my neck, they began to wander up towards my eyes where they stopped once again.
I felt the thing breath on my neck and I chill ran down my spine.

"Next time you won't be surprised"

I have no idea what it meant.
Should I be scared?

Hours of sleep: 4