That’s not going to be easy.
It’s not as easy as you think.
It will be hard.
These arguments never stopped me. And they will not stop you from achieving your goals, ever!
Let’s analyse it:
People who tell that, are very pessimistic, right.
But they also do not believe in you. Their perspective does not involve your abilities, your possibilities in near future and all of your mindset.
I for myself am sometimes over optimistic.
Of course, you have to calibrate, whether you are too optimistic or not optimistic enough.