Yes, you can perform them too, but only as much as you need for your livelihood. At the same time, you must pray to God in solitude, with tears in your eyes, that you may be able to perform those duties in an unselfish manner.

You should say to Him: 'O God, make my worldly duties fewer and fewer; otherwise, O Lord, I find that I forget Thee when I am involved in too many activities. I may think I am doing unselfish work, but it turns out to be selfish.'

People, who carry to excess the giving of alms, or the distributing of food among the poor, fall victims to the desire of acquiring name and fame.

Reference: The Gospel of Sri Ramakrishna (5.1 The Master And Keshab)