"How To Win Friends And Influence People" helped me a lot with social skills that are obvious to most people but not to me. It's still something I work on regularly, it doesn't come naturally.
I double this. Listened to the audiobook recently. I've always considered myself quite a communicative person, but only after the book I realized how much improvements can be done here.
Still, I find it a bit manipulative, so I would only use the techniques in working environment and stay "myself" and direct with friends.
I have had the same experience. It has always been difficult for me to handle social relationships with others when growing up (I cannot understand how others feel/think about me). "How to win friends" offers an (behaviourism?) insight into what you do can make others feels what. It's like a handbook really!
this is one of few books that i actually read several times in my life.