How many out of the 175 are real friends in the true meaning of the word? How long have you known them? How often do you see them?
There are perhaps 20 or 30 family connections, 20 from my school days, probably 10 long term forum members and most of the rest are people I worked with at various jobs before I retired. I worked in banking for about 20 years and half a dozen different retailers for the next 18 or so. They are spread all over the world, so some I will never see again in the flesh, but they are all people I could have a good chat with if we caught up face to face.
I know where you are coming from. I know lots of young people with over a 1000 friends and they can't possibly know all of them. I reject friend requests often from people I don't know.