Lonliness is an interesting emotion - it makes you feel alone, yet it has almost no correlation to how many people might actually be around you. An emotional disconnection from others, as opposed to a physical separation.
I'm sure there are a lot of new students here who might have met many people over the past few days, yet still feel a bit lonely. Don't worry about it, once you start to make meaningful connections with people, which takes much more time than a few days, all will be fine.
Alternatively, I find the voices in my head make good company