Yeah as you said i would love physics but i want a reasonably good future .... thank you sirI don't see the field of physics with dollar signs. I see it as personal fulfillment; getting all the education you are interested in getting so you can begin making some progress of your own. Basically, the drive to understand and discover. Ideally, if money is to be made in the process, it would be mostly a side effect of that effort to strive to answering questions with no current answers. Strive to either find something new, or apply something in a new way. Some kind of advancement with your DNA all over it.
The reality (as I understand it) is that everyone needs to pay for a roof and food, and maybe clothes. There is definitely a competitive aspect to having a degree or post-doc in physics - as research funding is even more competitive from experiment to experiment. And of course it is very hard to substantiate the research of some of these experiments to investors - as the result of these experiments do not always provide a practical financial return - and investors are not interested in the unknown advancements in technology these results may bring down the road.
What I say, and of course this is my personal opinion; If doing physics is what you truly want to do, then go for it. Use your drive to aim high, and don't let go. Whatever happens post-doc will hopefully end up in a positive light, but who knows. Just aim to do what you are passionate about. If you are ready to put in the work, if your drive is in synch with your passion, you will end up being competitive in your own right.
I rather get my education in something that I am passionate about and become the best at it, and maybe end up making less money - then get more pay in something that makes me hit the snooze alarm every morning.