Low alcohol tolerance or something else?

So I’m young (22), have a very small build and low body fat %, only started drinking a little over a year ago, and only drink very rarely. By all means, it makes sense that I would have a low alcohol tolerance. I’ve only actually Gone Drinking a handful of times, and twice now I’ve ended up throwing up despite not having drank much (imo) and not even feeling very drunk afterwards.

The first time this happened I started feeling sick early in the night, ended up having four drinks, and woke up in the middle of the night really sick, and continued to be sick the entire rest of the next day. I remembered feeling sick Before even drinking, and because I was traveling and ended up sick for a whole day, I wrote it off as probably something I ate or a virus I caught.

More recently, I went out for drinks with some friends. I had two drinks with mezcal, and just when I was starting to feel a little tipsy, I was finishing off the last of my second drink and suddenly started to feel like I was going to throw up. I spit out the last mouthful of my drink, thought I was okay, then promptly threw up. Twice.

In this second case, I actually felt completely okay afterwards? And barely affected by the alcohol even though I was feeling it just a few minutes before.

Is this low alcohol tolerance? Just a result of me not pacing myself? Or is there something else going on here?

I probably should mention that it’s also fairly common for me to start to feel sick and gag on my food while eating, especially when I’m anxious, but this has never ended in me throwing up before.

It’s really disappointing to go out with friends with the intention of getting a little drunk and having fun, only to not be able to get past two drinks and still barely feel any different, not to mention embarrassing to throw up in front of everybody. Does this seem like something that will get better if I build up more of a tolerance? Or will I just always have to pace myself more and drink less than everyone else around me? Or could this have been a one-off incident and unrelated to my alcohol tolerance?

Sorry if this is the wrong place to ask!! I’m just really stuck on this and don’t know how to begin asking about or researching it.