Is it normal my boyfriend is still normal after…

Personally, I think it's something you should speak about with him. Even if it's not an issue with him, it does seem to bother you a bit and it would ease your worries.

He'll want it again or expect it, possible the friends will as well.
Question is will you, and if so, you need to figure out why you you feel ashamed or guilty.

Part of it I'm sure was the alcohol it will loosen inhibitions. Experiments have shown even people who think they've been drinking will do things out of character, things they basically want to do but are afraid of being judged.

You have nothing to be ashamed of. A lot of people have this as a fantasy but never get chance or actually do it. You now know if this is something you like or would ever want to do again.

I personally believe you were set up, guys don't normally share their gf or do a gangbang on their friends gf with out first talking about it. Even if not planned it's kind of a set up when you're the only female in the room drinking with multiple guys.
Hell that sounds sexist, it's a set up if you have 3 or 4 LGBT people in the room drinking and one person they all wouldn't mind doing. There's a plan in somebody's mind how to get it done.

It's something you need to talk to him about.

First sorry you fill bad ,second why would your BF allow that shit to happen with is friends with you without telling you First cause in some point or another Bf and friends talk about doing that.Last you must've like the idea getting fuck by 3 men cause you didn't stop it? Just saying

Umm, i dont come on to chicks that have been drinking. The only time I think having drunk sex is acceptable is when u are with your significant other, in which u both know that u could still trust eachother when drunk.
If u have regrets, talk to your boyfriend about it, say u felt u only did it 'coz u had a bit to drink but wouldn't of appreciated it sober. Just to see how he reacts.

It's probably something they have discussed and you were not aware.

How did you feel in the moment? Is it something you would have done sober? Did they take advantage of you?

All things id be asking myself.

Such activities are a normal experimentation when younger; and many people never do them again.

Others find the experience pleasant and continue with them.

Its up to you to decide if you want to do that again and under what situation, or not.

Your BF may be OK with whatever you decide, and he may not be as well. That is life and why you date before you marry.

I wish you the best in life,

I would take responsibility rather than trying to pass the buck and blame him if you're ashamed about it.

I personally believe that you enjoyed it, he enjoyed it, and he is probably very proud of you. If everyone enjoyed it you probably should talk to him to establish some ground rules for it to happen again.

Sounds like you are just a "filler" until somebody better saunters along. I think the foursome should have told you something about the future of your relationship. Just saying.

Don't think he even remembers it... lol

Just move on. I've been there too. I just wouldnt bring it up.

You decided to get drunk, it is your faule, now you have to deal with it