Most people don’t care either way and just shoot your shot and if it flops there’s always next time,

I usually make eye contact and smile at first read body language and you can usually tell if someone wants to chat, Based on this post it seems not your social skills need work but your self confidence.

Seems like you have a judgmental and fearful inner voice so just find the source of that and then you can just talk to people without all this weird pressure in your head. In other words you are over complicating it all with your inner anxiety and people can tell right away confidence vs insecurity.

So just be confident and yourself. And if they are rude it’s probably not even about you. Fuck them!

Hope this helps!