Do you think my uncle wanted to do something sexual to me?

We had a big family vacation, where most of my aunts, uncles, cousins etc. came along, we rented a cabin by the lake, and I was going to be sharing a bed with my uncle tommy, he's single and 39 years old, and I'm 15, my uncle and I shared a bed, it was kinda small, but it was okay. Well my uncle wore one of those black jockstraps that only covers your privates but his butt was completely exposed. and I mean the only thing I wore were briefs, that's it but the bed was small and I could pretty much feel his body against mine. I could feel his erection along my body. 

Hi,

Sounds disturbing. Have you ever felt that he has behaved inappropriately in the past or felt uncomfortable around him? Was the erection at night or a physiological one in the morning? I am sorry you had this disturbing experience, keep talking if it helps you.

Cracked

Well the thing is, I was not disturbed by it at all, I've felt very good around him, very comfortable. We have this same sleeping arrangements when I spend the night at his house.

This sounds potentially like he is grooming you. How do you feel if he is trying to do something to you?

Cracked

Well I don't know but when we all left, he said goodbye to all the males in my family a handshake and I was the only one who received a hug and it was strong, I could feel his reaction in his pants and I think he could feel mine. I have three uncles, out of all of them, he is the nicest one to me, he's the one that I think is handsome

This sounds like an unhealthy relationship. It sounds like you need to be careful nothing happens. Your hormones are probably all over the place but this does not give him the right to treat you in this manner and take advantage of you. Please keep yourself safe and don't get into one on one situations with him.

Cracked

Hi! The relationship you seem to have with your uncle is not healthy. Don't let it continue. He's a grown man and you're a kid, it's not your fault. Tell your parents about this "sleeping arrangement".

It's a possibility that he wanted to do something. I can't rule it in or out though, as there's a lack of data. Men do sometimes have spontaneous erections.

I'm hesitant to call something like this grooming without knowing his level of involvement. Being a family vacation, it makes me wonder if there was simply a shortage of beds, and how the family members tend to dress for sleep. It could potentially be something blown out of proportion.

One thing for certain is if you feel uncomfortable sleeping with someone, you're not obligated to. If that is the case then I believe you should inform your parents that you want to sleep alone or with someone else other than your uncle in the future.

Well the thing is that I'm sort of attracted to my uncle

Your boundaries have been messed up, that's probably where the attraction comes from.