Trump had a very comfortable childhood - until sent to military school. Trump writes that he was aggressive and assertive from a young age. Trump has a textbook narcissistic personality disorder.
He seems unusually self-confident, and shows feelings of grandiosity and entitlement. These individuals tend to make a good first impression, but are difficult to work with because they feel entitled to special treatment, ignore their critics, and intimidate others. He'll tend to overestimate his capabilities.
Did Trump's Dad equate love with success and accomplishment?
"Trump is “a near perfect authoritarian leader.” As a personality type, “these people are usually initimidating and bullying, faintly hedonistic, vengeful, pitliess, exploitive, manipulative, dishonest, cheat to win, highly prejudiced, mean-spirited, militant, nationalistic, tell others what they want to hear, take advantage of ‘suckers,’ specialize in creating false images to sell self, may or may not be religious, are are usually politically and economically conservative and Republican.”" - John Dean