<human>: Provide a brief overview of the text.

I've been with my girlfriend for about 1.5 years now. I'm uncomfortable telling her my Credit Card PIN because I was always raised up with the mentality that it is one of the things I should never tell anyone, just like my SIN. Am I being too uptight/not trusting enough for not telling her my PIN? I told her that if she wants me to buy anything then I will just buy it for her.

The whole situation came up when she wanted to buy underwear but forgot her purse and wallet in the car so she wanted to use my credit card. I told her I'd buy it for her but she said she would get embarassed when I'm at the register. I don't see it as an issue. Is it just me?
<bot>: Girlfriend is angry at me because I didn't tell her my PIN number for my credit card. Im not comfortable telling her or anyone for that matter.