Weird Dream ??? Whys it happening ?

well it was really scary it's called sleep paralysis and it happens to me all the time maybe twice a week and well here's the dream : i was in my own room and i was asleep in my bed in the same position as i was in real life then i woke up (in the dream) and then i got up to go get a gl of water and there's a cupboard sort of thing attached to the bottom of my bed and it was open and as i walked past something pulled me under and when i finally plucked up the courage to look to see what was dragging me under, it was lady gaga (random i no) then i screamed and was kicking her away and then her eyes went Like BLOOD red and shot me and put a hole through my hand and then i screamed again ( i screamed in real-life to) and my cousin was sleeping over that night and everyone even the cat's in the house burst in my room and i couldn't wake up for like another 15 Min's according to my cousin and im only 11( i no to young but i've got permission to be on here )anyway when i woke up i was shivering and now im really scared of the cupboard thing and they happen all the time but there not all sleep paralysis one sometime there just weird !!! Whys this happening to me !!!!!! :(