Credit card

I worked part time job from last August to April. My job was to recommend credit card into customers at the super market. I didn't make my credit card during worker. Then I always refused to making it. But I made up my mind to make it after I retired. And I will bring it to America! So I made it at last. But to tell the truth, I am afraid that I have it. And I don't want to direct debit. If I will go to Usa, I will never use it maybe!!