Strong Sexual drive

I'm currently 17 years old.

My sex drive is very high, which means that sometimes i wake up at night and my pants are gone.

Also my Girlfriend told me that i often take her hand and put it in my private zone when she sleeps at my place.. I dont want to do this, but i cant change it, since i'm asleep.

I also get a hard one if i just hug her. Sometimes also when we just hold hands.

She talked to me about it and i realy dont know what to do about it. I dont want to be some kind of sex monster. Maybe its just a phase but i'm doing it since around a year i guess.

What can i do to controll my body better.