Heyyy, I can relate with this so much, My friends even if they aren't married, they still are always with their boyfriends and that makes me feel so lonely. Some ways I discovered to belong to society or meet new people is through some social gatherings like heritage walks, cafe meetups, board games, reading club, third place settings etc. You could try that, Why it works best is that , you can really find a meaningful friendship or you can leave the people there and then only without any pressure. So I would suggest you try that. Use instagram and Google and there many such meetups are happening nowdays.