My sleep Paralysis are getting more and more...er.. sexual? (This is going to be long)?

I've had sleep paralysis before multiple times. I've learned to keep my eyes shut because otherwise I'll start seeing things. I can't help the hearing things part though. Anyway the first weird semi-sexual encounter was one day I was sleeping on my stomach and out of nowhere I felt the back of my shirt going up towards my bra. The weird thing is I don't think this was sleep paralysis because I THINK I was able to move but didn't because i thought it was my sister messing with me (it wasn't). I didn't move and after my shirt got to my bra I felt something that felt like nails lightly scraping down my back and then it stopped right at my tail bone. I started thinking 'ok this has gone far enough' right after thinking that it got rougher and I jumped up and my shirt flew back down and it was gone. OK the next encounter I was sleep on my back and I had just gotten out of the shower so only had my bra and panties on, I heard this weird fan noise so I opened m y eyes and this time couldn't move. my chin was kind of up so all I could see was the headboard and the wall behind it. all the sudden I heard heavy feet coming up the stairs quickly. (God that had to be the worst moment of my life) I tried so hard to move but only felt like I was being pushed down. finally the feet made it past my door and it felt like my bed was bouncing a bit. Kind of like when someone sits on the edge of your bed. All the sudden I heard a voice humming softly it kind of sound like myself which freaked me out. Then suddenly it got deeper (a man voice) and chuckled a little while it still hummed. (wasn't a song I recognized by the way) and I could feel a hot hand touching my stomach rubbing up and down and getting closer towards my bra. I really started freaking when I felt two arms sliding up my stomach and two hands cupping me. The more afraid I got the stranger the voice started sounding, kind of deeper and scarier. The voice was also closer to my head. Then just as soon as it hopped on the bed the feeling was gone and once again the bed bounced a little and i was able to move. OMG I was so terrified!!! I don't know what to do anymore! People say call on jesus but I tried that before and all I got was a chuckle from whatever it was! by the way this isn't the last encounter but I don't want to carry on the encounters got a little worse and a little more graphic and I honestly don't know what to do! HELP! why is this happening to me!