Yeah, it can be intimidating but actually most airsofters are a friendly bunch and you'll quickly meet new people.
I did have an advantage of meeting a few people at a training event and having nods etc. I didn't run with them but I recognised a few faces around and having been doing milsims off and on for a good few years made it easier to slot in from the task force side of things. Tbh if I was getting back into it just enjoy causing chaos with opfor you'll definitely enjoy it 👍