> These tips [...] are not for building relationships

These tips gots me friends and girlfriends, one of her lasted 11years and still counting. Before reading it I'd describe myself 95% asocial + 5% weirdly social, with mostly no relationships.

These book really deeply changed me and oh boy I'm far from a salesman.

Your mom and robotic salesman obviously aren't good exemple to follow and that's a great start you noticed it. Get courage, one week of reading and I promise you you'll be changed, my friend.