Hi!

I can relate with most of the things you've said, except I don't have siblings. Had no friends growing up and at most a buddy in highschool and a buddy or two in university/masters. Now I have two friends I hang out with once a week or once every two weeks but I have little in common with one of them.

Point is, it's hard for me to make friends as well, partly out of mild introversion coupled with a bit of social anxiety, partly because I stick out as different due to being unfeminine and also in big part by having little experience with socializing on a deeper level, holding small talk, etc.

If you have hobbies, I would suggest meetup groups, especially since you're in a very diverse place. Meeting people who get together precisely to enjoy a common interest can make it easier to make friends cause the people there are interested at least in one of your hobbies and you have that to start interacting with them.

Then, as others have said, try to open up about yourself, ask questions about the other person's life, show interest in what they're saying . Those things work, especially if there's nothing visibly "different" about you, that could influence interactions before you say anything.