I'm 17 and stayed the night at my grandmas house with my sister and cousins. My 13 year old cousin and I slept on a l shaped couch and weren't near each other when we went to sleep. I woke up around 4 am and he was trying to take my underwear off so I just rolled over and went back to sleep and then I woke up again and he had his fingers inside of me and I was so scared I didn't know what to do so I just laid there and acted like I was asleep and I kept moving every time he tried to do something but I eventually fell asleep again and woke up with his fingers inside of me again. After this I got up but I'm to scared to tell anyone. What should I do?