I think my uncle is a molester? Or a sex freak..?

Okay, so my aunt is 30 years old, and she married my uncle when she was 28. My uncle is 32 years old.
They have a 2 year old son (and i THINK the only reason she married him was because she was knocked up.. but i don't know for sure.)

Anyway, i thought he was really nice at first. He seemed like he's a good guy and stuff. But recently he's been acting very strange around me. I'm 15, almost 16 years old.. and like i dunno. Sometimes when i come over to their house to babysit, he'd come home from work and lay on the bed and stare at me..? And i'd feel so awkward! I'd smile and walk away. Anyway, THIS really recently happened like last week, i came over to their house again, and my aunt was home then. It was late at night and he said to me WHILE my aunt was doing the dishes, he said, "Hey, so you have any boys at school that like you?" And i said, "No. I don't think so." And then he said, "Oh ... that's weird, you're a very beautiful girl."
And i thought it was a nice compliment, but i was TOTALLY freaked out. I said, "Okay." really quietly to myself.

My aunt came into the room and she asked if i'd like to sleep over, (it's summer still) and i said, "No thanks, i got to go home and clean my room" (this is my excuse btw) and then my aunt said, "Oh, that's right! We don't have any spare rooms because we still have all the junk in the other room."

So my uncle said, "Oh, that's okay.. She can sleep with us if she wants, we have a king size mattress."
Then i started to get red and i was really uncomfortable, and i noticed my aunt laughing like it was some joke or something. So i pretended to laugh and said, "No thanks." And i called my mom to pick me up.

Okay, now this happened YESTERDAY.
They came over to my house for dinner because my mom was cooking, and i went into my room and changed because i didn't realize i had a stain on my shirt. And he knocked on the door and told me dinner was going to be ready soon. I said, "OKAY." But i don't have a lock. So i tried to look for a t-shirt and change as fast as possible, and then i heard the door knob turn, and the door creak, so i jumped and screamed, "I'M CHANGING!" and he still continued to open it. I was in my bra!
He looked at me for a straight 20 seconds. Literally 20 seconds. And then he smiled like he was embarrassed and apologized.

He's not ugly, he's actually pretty good looking.. but he creeps me out.
Does this sound convincing that he's a freak? I haven't told anyone yet because i don't want them to think i'm crazy!