I'm an ambitious little boy, and when I think of medicine (I'm cocky enough to think that I would have had a decent chance to get in if I had applied) I think there is a level of success that you can not exceed, you can be the Head of Surgery somewhere (not meaning to undermine this, a very noble position). That said I must also say that whilst I personally view jobs such as a GP as perhaps a bit boring (though they can be rewarding), they do earn 250K a year constantly once they are experienced enough.
On the other hand, if you go into almost any other field, Scientific Research, Commerce, Engineering, IT, Marketing, Music, Art, Sport, and so many other things, the limit to which you can get is near endless. You could be finding cures for diseases (may not bring you much money, but that would be damn amazing), CEO of some company, developing new and amazing life altering technologies, be the new Justin Beiber, represent your country in a sport... whatever.
To put my feet back on the ground, yes, on average you would earn less than a doctor, but you too have the potential to be something amazing should you be passionate and put in a lot of effort into it what you do. This could be in the form of whooping a Doctor on Salary, or just being a part of something that you actually enjoy and brings you the money you need to support yourself and your family. So the next time someone tries to force upon that mindset of Medicine or nothing (which I think far too many people have) just know that you can do well in almost any field you choose to enter.
P.S I am speaking as if no one enjoys being a doctor, it can be very rewarding too and obviously a lot of people do enjoy it, I'm just addressing the people who are being pressured into becoming one.