If you only socialize with people you don't like because you are "forced"/"pressured" to, you aren't going to have a good time.
Socializing is supposed to be fun, if you turn it into a job you hate, you aren't going to get the benefits of being social
Not everything in life is about "having fun". Pushing yourself beyond your own comfort zone, or being pushed, is by definition not going to be enjoyable in some superficial sense, but it's the only way you'll ever actually engage with anything new or unfamiliar and grow.
Nobody who is grossly out of shape enjoys showing up at the gym the first time, but even though they don't enjoy it, it will benefit them all the same and eventually they may very well come to like it. It's the same with education, decades of trying to make education "fun" have resulted in large amounts of people being unable to absorb anything that isn't in some trivial sense gratifying.
It's perfectly A-OK not to like going to social outings with others. But until you've tried it, you don't actually know whether you like it or not.
Of course not. However i would put recreational activities squarely in the "having fun" category.
However being social and not being lonely is not the same thing.
If I meet someone genuine I will engage with them, otherwise I much rather to keep to my own devices..
Side note: I'm not sure what you mean by a "fake" social gathering. But for me, I've been taking part in a debate society, and some French meetups lately to socialise more, and I've loved it. Everyone is genuine in that they're there for a specific shared interest. And I've found that my thoughts/ideas are greatly improved from the ability to debate with others. Sometimes I'll realise I have a huge blind spot, and need to reject an idea. Sometimes I'll realise my idea had a short coming and that it needs to be adapted. Either way it just improves my thinking.
Reduces mortality, increases happiness, cardiovascular health, etc.