Sitharaman also credited her elevation to a cabinet rank minister to "cosmic grace" and support from party leadership.
"I am just overwhelmed and humbled. I can serve the country with something which is constantly on the top of my mind," she said.
Stressing that it was a big responsibility, Sitharaman said she was "very grateful" for the confidence the Prime Minister has on her.
Asked whether dealing with Pakistan in view of terrorism will be her priority, she said "I have not even taken charge. I don't think it is appropriate to comment on it now...Give me some time."
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Sitharaman was among the four junior ministers who were given cabinet berths at the reshuffle today. Sitharaman was earlier the Minister of State (Independent Charge) Commerce.
"Somebody who has come from a small town, grown into the party with all the support of the leadership, and if given such responsibility, it just makes you feel sometimes that cosmic grace is there. Otherwise, it is impossible," she told reporters here soon after taking oath.
"Every criticism is a message and we have to learn from it. I am not averse to criticism and also not frightened of it, but certainly take messages from them.
"Criticism per se do not reflect on performance. It only adds to your performance if you are ready to take on-board the corrections that may be workable," she said.
Sitharaman was also quick to highlight a number of initiatives by the commerce ministry like Start up India and Make in India.
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