If you normally go quiet when you get angry, you may not relate to a character that reacts very differently. But if you see someone internalising the anger like you do, you will immediately identify with him or her. It's these small things that penetrate your psyche and make you relate at a deeper level.
Becoming the character you are playing might work for some, but for me, it doesn't. I always maintain a gap between myself and my character because if I will go so deep into it, it will get difficult for me to come back. You should work towards understanding the psyche of your character and then play it.
We humans need to reboot and learn to have gratitude for our doctors, police officers, or those providing essential services, otherwise they would feel that it's a thankless job. They risk their lives for others and don't even get time for their own family. We need to be more compassionate, caring towards them instead of misbehaving.