I dunno! They might do. They might not. When I came here, I came because someone that I cared about was also here, and I wanted to make sure they were all right. So they recognised me. I hear that's not uncommon! But it's also not uncommon for people here not to know anyone at all when they first start out.
In any case, it could be possible that someone here does know you, and doesn't remember yet, too! So. Whatever, everyone's in the same boat, y'know? Don't get too down about it! It's a good thing! You can start from scratch!