I never worry of others` opinion.
worry ABOUT
One shouldn`t object in the inconveniences if something goes wrong.
object TO
Climate is unlikely to change in Europe in next 10 years.
OK
One shouldn`t apologize in making not serious mistakes.
apologize FOR
It`s easy for me to concentrate for something important in a noisy place.
concentrate ON
One can`t be certain in the future.
certain ABOUT
One should be proud for themselves even if they are hopeless in something.
proud OF, hopeless AT
Don`t believe on anything, rely in yourself only.
believe IN, rely ON
While looking forward for something important, people waste their time not living.
look forward TO
People all over the world are fed in of poor standard of living.
fed UP WITH