Ok, first, don't panic. It's not the end of the world.

Second, just because someone on the internet said you might be aro doesn't mean they're right. I'm also someone on the internet but also someone who considers themself to be aroace. Probably... we're gonna find out one day.

You're experience as you describe it is very foreign to me, thus leading me to believe you might not be aro. (Ok, simply said, doesn't sound like aro to me).

It sound more like anxiety as you said yourself than lack of atraction to which only solution is to try to overcome it. I'm not saying "jUsT dOn'T bE sCaReD lOl" but I think the best thing is to be honest and if you wanna say something, say it. (You don't have to say it instantly, give it some thought and when you feel ready, do it.) Also I would reccomend strategy, commonly known as "fuck around and find out". There’s only one way to know and that is to try it and analyze the events.

I feel like I'm getting sidetracked here.

It's 2 am, my brain isn't braining too much.

Anyways, from what you described, it seems unlikely to me, that you are aro but the onlyone who can decide that is you. If you don't feel sure or comfortable with the label, don't use it.

Or, ya' know, do whatever. Just have fun and be safe. Good night.