I felt really uncomfortable

Ok, last night me and my girlfriend went over to one of her friends house's and there were probably 5 or 6 other couples there. This was only the second time I had hung out with her friends and didn't know them too well and things were going ok for a while and then my girlfriend pulls me into her friends room and shuts the door and we start making out. One thing led to another and next thing I know we're on her friends bed having sex. Now her friend has a queen size bed so it's pretty big. So we're doing it and her friend and her friends bf walk in and my girlfriend pretends like it's no big deal. Her friend asks if they can share the bed with us and so they start having sex in the same bed we're in! I felt very uncomfortable. It gets worse, another couple comes in, thinking the room is unoccupied and this girl I didn't know starts giving her bf a bj. I was very nervous. To top it off, the bedside lamp was on the whole time so everyone could see what everyone was doing. I got nervous and ejaculated prematuraly while the guy next to me made his girlfriend howl with pleasure. I was so embarrassed. One, is it normal for things like this to happen, even among teens? Having several couples in the same room having sex. I just don't feel comfortable with it, what should I do?

Do you think it's normal?

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