Why do people gatekeep their friends from social circles and activities?

Why do people gatekeep their friends from social circles and activities?

I been living abroad for 8 years and I struggled with feeling alienated and disconnected. I have some old university friends and we see each other once every few weeks or months. I have also made one female friend on social apps. I noticed something. My friends have very nerdy niche interests and are neurodivergent, they do invite me to get togethers out of courtesy but I feel they never make the effort to bond or be closer friends. I end up listening to them and adjusting, but they don't meet me in the middle. I have had closer friendships online but it's frustrating not being able to physically spend time with said people. Also my female friends, they pretty much show off to me activities they do that I would enjoy but they didn't invite me to and they tell me how much they enjoyed it.. It feels like I am a placeholder friend. I don't enjoy what the popular activities there are like drinking, clubbing, going to pub crawls. When I tried doing those activities I felt incredibly out of place and alienated. I have days when I feel really depressed. In dating department I am never lucky to find someone that feels the same about me even when I put my best forward. I feel like all the work I have done is in vain if I can't be happy with people that want to do activities together and enjoy each other. I feel like something is wrong with me everytime I am getting rejected and like I need to spend even more time alone and be better alone, but I am 27 years old and when I look around people have got a lot more going on. I just have a remote job and remote studying...

Why do people gatekeep their friends from social circles and activities?
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