There is not enough social activities to know more people. People usually just stay within their social group such as classmates, colleagues, neighbors, ..
I think so. Most of my friend stay with the same group for 10+ years. Don't see them making many new friends over such long time span. I am doing ok since I join different groups and always have different activities each week. More importantly, I already got a gf. No need to worry at least for now.