I have a hard time figuring out when it's ok to try and approach someone and try to talk to them, and when they would probably rather be left alone; I have found some people I feel like I relate to really strongly, but they have their DMs turned off on whatever platform we share or don't provide any contact details, so I assume they probably don't want new friends, but it's hard to tell.
A lot of people kind of give off the vibe of "I already have all the friendships I need and I don't want more" and that makes me wonder if maybe it's something where you have to be there at the right time and find people early enough. I definitely do not have everything I need within my own friend groups yet.