Saying "You're welcome"

Normally, when people say thank you to me, my immediate reponse is, "Oh no, thank you," or "It was nothing," or anything that puts the focus of attention away from what I did, and back on the person who is thanking me. I'm not quite sure why I do this. Something in me feels like it's wrong to be thanked for doing something, like I'm bragging or showing off if I receive their gratitude for what I've done. Maybe I think that if I accept their 'thank you', they'll think that I was only doing it to get thanked, to get praise, that it was all an act of doing something to get something in return. I really don't know.
This morning, my room mate went out to get his New York Times from the front step and couldn't find it. He came back in and asked if I had brought in in for him and I said no, because I hadn't. He checked again on the steps, couldn't find it, and ended up reading it online. About twenty minutes later, I left to go to to the grocery store. As I got to the bottom of the steps, I saw a white newspaper bag with a movie ad on it and wondered if it might be my room mate's New York Times. I picked it up, opened the bag and saw, "All the News That's Fit to Print."
I was running late, and I considered just leaving the bag on the steps for my room mate to find later or to bring in to him later when I got back from the grocery store (after all, he was already reading it online). But I knew that he loved reading the paper on Sunday mornings on our couch with his coffee in hand and I knew that if I brought it later, he'd have already read the whole thing online and would miss his lovely Sunday morning routine.
So I went back in to the house and brought it to him.
"Thank you!" he said with a smile.
"You're welcome," I said back, and then I felt really good, kind of settled and happy.

It was interesting; in saying "You're welcome" to him, I actually felt the act that I had done. I actually felt the care that I had for him. I actually saw that I had chosen to bring him his paper instead of getting to Trader Joe's before the crowds showed up.
Now, this is not some big act of compassion or kindness and I'm not trying to say "Oooh me! I'm so nice!" I'm just noticing that I actually felt myself when I said "You're welcome" to him.

See, often I feel a disconnect between the person who everyone sees, and the person who I feel I am. This is changing as I'm seeing myself more and this morning, when I accepted his gratitiude, it was like I completed the act or something. It was like I actually connected with what I was doing.
I don't know, I thought it was interesting and it's something I'd like to be more aware of in the future: actually accepting people's words of thanks so that I see the effects of my actions on others and allow others to express their gratitiude to me, and being present to and aware of my entire action, sticking around past my intentions, staying present to the response of others too.