Amen ShyRem! I had a previous career that I HATED so I know what it's like to be miserable and be bitching about my life all the time. On the other hand, I also know that I can control my happiness, at least professionally, and so I changed careers and am much better off and much happier. So I tend to ignore all the negativity and just realise that I am content with starting med school and the long road to becoming a doc. I know I have made the right decision for me. I know it's not going to be easy but my family is incredibly supportive, and I have wonderful friends and an amazing SO.
Finally, I grew up in a family where my father is a doc and I watched the ups and downs of a solo family practitioner so I am lucky to have been able to see the realities of medicine. But in the more than 30 years he's been practicing, he's always loved his job and until this day, doesn't regret going into medicine. Having somone like that to watch and learn from, for me, has been helpful in ignoring all the negativity I hear about elsewhere.