Hate to pile this on to the nondrinkers, but drinking have been the wheel to get my courage going haha. I've known the most introverted people who've now broken out of the shy shell and are now very socialable after drinking. Keep experimenting with different drinks and yall will probably find something you'll like. In moderation!
If you still refuse to drink, movies are an easy ice breaker.
Not choosing your post for any particular reason, just using it as a springboard to point out that drinking is not a magical solution for everyone when it comes to socialising. Now, I'm not a non-drinker, because I tend to like alcoholic drinks for the taste. But I've never been drunk. Not once. Why? Because I seem to come with two settings: slight intoxication - we're talking restaurant levels here - and spending the rest of the night hunched over a toilet. I know this because I've tried to get drunk. Friends have tried to get me drunk. It never ends well.
I can be rather extroverted when I want to so I can enjoy parties for a few hours, when most people are still at my level of slight intoxication, but after that, it goes downhill quick. Being the only non-drunk guy in a room of drunk people is not pleasurable and I tend to bow out as soon as I feel it is polite to do so. Incidentally, this is why I don't host house parties. Nowhere to run to. And then there are the clubs. The goddamn clubs. My personal version of hell. Let's just say that being in a dark, crowded, stinking room with music so load you can't hear other people even when they're screaming in your ear and there's nothing to do except do shots at the bar is not a pleasurable experience when you're halfway sobre.
So what's the point of this ramble? That parties and getting drunk aren't for everyone and I don't get the social pressure that they should be. Maybe people need validation that there's nothing wrong with them (which, for the record, there isn't) and need constant reassurance by having everyone else go along with them. I prefer other types of socialising: trips with friends, movie nights, just doing stuff in general. I actually like pubs for that matter, because they're not meant for people to get black out drunk in and tend to keep people on a more functional level where they can at least still hold a conversation.
So my advice for the OP is this: do you
want to like parties? Is that actually something you think you'll ever enjoy? Or would you prefer to do other things with friends? Because there's no reason for you to beat yourself up and feel bad about yourself for not liking parties. They're somewhat of a social imperative in the 20-something demographic these days so they're hard to avoid outright, but not liking them doesn't mean there's anything wrong with you. Maybe they're just not your thing, because they aren't really for everyone.
I'm introverted but can often be a Leo-esque natural leader in social situations, quite bold and sociable. Alcohol helps.
However, it's exhausting and after a short while it palls and I need to seek isolation to regenerate energy.
In summary, introversion is more so about how one derives social energy (from others or from self), not the degree to which someone is capable of capitalising on that energy.
This too. I'm just the same, I know how to be sociable - I can come off as very extroverted when I want to - but it's tasking. Especially when it comes to meeting new people. There are some rare occasions where I can get energy by hanging out, like having a coffee with a friend or seeing a movie, but for the most part it's like a good workout: it can be fun and rewarding, but I need to be alone to rest afterwards. People who aren't introverted seem to have trouble understanding this for some reason.