My boyfriend's co-workers didn't seem friendly toward me, and I felt alienated; Is this normal?

[Anonymous]

This past Wednesday, my boyfriend mentioned that him and his co-workers, a man and a woman, were going out for dinner and that he wanted me to come as well, so I said yes and asked him if I could invite my male co-worker and if that would be okay with the entire group?

Due to coordination issues, they instead agreed on a Sunday morning brunch. My boyfriend then told me that he didn't ask his co-workers about me also bringing my male co-worker so that he, him and my male co-worker could go out another time if that were okay.
So I told him no worries at all, that we could coordinate another hangout another time, so today arrived, and he picked me up, and we headed to the brunch location.

His male co-worker had come 30 minutes prior, I greeted him, and we said our friendly hello; hence, we still needed to wait for his female co-worker. We decided to head into the mall and walk around; my boyfriend and his co-worker ended up chatting, and I honestly felt alienated, lol, as I had no clue what they were discussing. Still, I was okay with that as I understood that he was simply happy about having his co-workers there and hanging out outside of work.
His female co-worker then 30 minutes later , and I said hello, and they then chatted between 3 of them for about 10 minutes as we waited to be seated, and I felt left out again, as I was not engaging in a conversation with them.
My boyfriend didn't try to talk much about me and me and my boyfriend didn't really talk the etnire time when we were seated lol, I bearly said anything as they continued talking aboco-workersork drama and so forth, but then his two co-workers never tried to get to know me.

Updates

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Still, I stayed quiet and honestly wasn't in the best mood, so the brunch lasted 1+ hour. When everyone left, I felt a bit mad at my boyfriend but also wanted to take responsibility, as I wasn't the friendliest individual, but I wish they had discussed other topics that weren't only work-related; hence I was there.
My boyfriend apologized for this, but now I feel wrong about the entire scenario.
We are both 26 and met in June, made things official in August.

[Guy13]

If they are good friends to him, you will get nothing. If you get the giggles about one of them when being rude to you THEN that one will be keeping his eyes on the possible assets.
You act right or wrong he will find some of that except “giggle box” guy.

[Anonymous]

I tend to avoid people who hang out with their coworkers. It seems like maybe you should do the same

[Opinion Owner]

These ar people who are desperate for human interaction, and they'll stab you in the back to fit in. Every time