Considering a switch from simulation engineer to psychiatrist. What should I know?

I am currently a simulation engineer working for a contractor, I have worked in the field full-time for about 4-5 years. I have a MS in electrical and computer engineering from UCLA and a BS in Engineering Science from Penn State. I have 2 years of volunteer experience as a wilderness search-and-rescue worker while working as an engineer.

The experience that's difficult for me to describe on a resume is the years and years of taking self-development courses, seeing different therapists, working with various coaches, dedicated practice of yoga and meditation, and reading many books in psychology and self-help in an effort to improve my own life. My journey is what sparked my interest in psychiatry and I believe helping people with their mental health issues is absolutely critical for the progress of the world.

What do I need to know about the field of psychiatry? Can I really make an impact? I know I will need to study up for the MCAT and get a good score. I'll need to apply to medical school and attend for 4 years and then do a residency for 4 years.

Also I know every industry has a dark side, what is the dark side of psychiatry? Is there any other advice you can give me?