We've all done it. We've read about a character or watched an actor and thought, "Now why can't so-and-so act like that?" Or - and this is even more telling, "Why doesn't s/he treat ME that way?" Here's a hint - they are not real. They were created from the mind of the author or the script writer and were given the characteristics that they'd like to see in others. In other words, they really don't know folks like that at all.
On the other hand, we've all had a reality check of sorts when reading a book or watching a film. We've recognized others and ourselves with amusement, guilt, distaste, and sadness. Why? The characters have been given 'real life' attitudes. Whether we like it or not, these are the characters that we bond with. Bummer.
Take a quick peek at what you like more: Fantasy or reality. And let that answer be the starting point for your character creation in your own writing. With that you'll have figured out what it is you do best.
And keep writing.