Because of this perceived hostile world, you can become up more self-centered to protect yourself, which can make you appear more cold, unfriendly and socially awkward than you really are.
Even though you think that you're doing this out of kindness and care for your friend, the truth is you are being unkind to yourself, not giving yourself the self-respect you deserve.
And now they entered a dark and seemingly endless pine forest, and all the stories Caspian had ever heard of trees being unfriendly to Man crowded into his mind.
On a daily basis, he had to deal with people who were unkind, ungrateful, arrogant, dishonest, jealous, and so forth. Marcus Aurelius was also a devoted practitioner of Stoicism.