Feel Bad

It was not a bad day, but I felt bad.

I hate the fact that Ellen and I have the same topic for our final project this semester in Functional Foods subject.
I don't wanna blame her, I don't wanna blame myself, neither the lecturer.
I sent an e-mail about my topics to the lecturer two days ago while Ellen talked to her face-to-face about her topic the next morning.
The lecturer did not check her email, so she didn't know that the topic that Ellen chose is the same with mine.

Then, Ellen told me that she has changed her topic so I can go with my chosen topic.
I didn't feel relieve at all, in contrast, I felt bad.
But I didn't know what to do.
I have searched the materials that are needed, and I have started doing on the powerpoint.

The issue it's not only about that.
When I was working on my assignments in my room, my mom came in and said: Didn't you hear that I was puking?
I said no because my iTunes is quite loud.
And she said that she puked twice in the bathroom and the bathroom is exactly next to your room. How come you didn't hear that?
I said nothing.
She went out of my room.
Right after she left me, I felt really bad.
Was I too focused on my assignments and ignored what was going on in my surrounding?

Am that careless?
Or am I just too sensitive because of the pressure that I felt lately?