At freshers week nobody can afford to be judgemental, as they're all gagging for friends due to some slightly irrational fear about going through the entirety of uni with no friends if they don't acquire some within week one.
That means being generally 'different' and your eye contact thing are incredibly likely to get a free pass. With regards to awkward silences, you tend not to have any as everybody feels obligated to get every other person's life story (You get tired of being asked where you're from and what A levels you did by day 2), so they're usually filled nicely up until the point where everybody gets more drunk, in which case the silence is then filled by people chatting ****. In short: Freshers flat parties don't have that many flaws as long as you don't overthink them too hard. That said, if you find yourself needing to make a quick escape from one anyway, you can always pretend you're getting an important phone call, leave the flat and never return. Just remember, it's people you don't really know. They're not going to get particularly hurt by it.
As for clubs, you'll have to just go and see, they very hit and miss. I only like certain clubs with certain friends, a lot of the time I'd rather be literally anywhere else. Other people seem to find that going to a club is something that has to be done on any sesh, for reasons I don't understand. Go and see where your opinions lie, but get yourself a taxi number or the uber app in advance so you can make yourself disappear if you turn up and decide it's ****. Speaking from experience, sticking it out till closing when you don't actually like the place seriously isn't worth it.