Hypocritical Ikaru incoming, but-
The thing about this sort of attitude is that if you're afraid of them BECAUSE you don't know them, there's no way to logically resolve that without just speaking or interacting in general as it is. It's a legitimate concern, but I'm a pretty big supporter of that whole "if you don't try, you have no chance of success" thing, regardless of how little I follow it myself. Easier to take others' advice than my own and whatnot.
/hypocritekaru
EDIT: I mean, if someone directly approached me and showed no signs of bad...ness, I'd be pretty chill about it, if maybe awkward because I'm terrible at conversation, but because of that I just kind of sit around by myself somewhere until something happens or I have to go. Relevant anecdote- I leave here on the 12th to go back home, and I'll be spending literally three hours in the Philadelphia airport (unless things change or delays or something happen) by myself. I would bet that I'll spend the entirety of that time sitting in one place, silently, at best looking around for attractive people to wonder how to start a conversation with and never actually doing so. If someone was to come up and say something, cool, I'll try and talk, but otherwise zzzzzzzzzzz
I don't mind interaction but you will never catch me actively looking for it.