Today a girl I know in school asked me to grab her sour cream as today we had nachos. The problem is they ran out and it was taking them a while to pass out more. I said there wasn't any. She said nevermind and walked away. I wanted it so I waited. I grabbed one for myself and one for the girl. I dont like this girl btw. She was sitting in a group with other girls. I just gave her the sour cream and she said thank you. But I feel a bit weird like I shouldn't have gone out of my way to do that. But at the same time I was already going to grab it for myself. I dont want the other girls in her group to think I'm some nice guy. I feel like I kinda fucked up. I don't like giving off that persona as a nice guy. Is this nice guy behavior or am I just overthinking this?