Life forcing itself

This is not me. I don't know who this is but it's not me. I don't know where I found all that courage from. I said what needed to be said at the right time and I put everything else aside, my pride on the line but not my dignity. I turned around, walked away from the scene and sat again with my friends. I sat staring at the table, I had no idea what was going on around me. I had to get away for a second. I went to get myself some water. I felt a knot tying in my throat, tears were so close to gushing out. This is not me. I don't cry. Now I can go on a whole day without food. I could sit without saying any word for hours on a stretch. I stared at how people got so worked up on things and envied them. I used to be like that, this is not me. I'm sure it will pass, I'll make sure it does. No one seemed to change, they all were the same and I....became an outcast in that moment. It didn't feel good. No one noticed, and I sat there in-between. Wishing they did, wishing someone forced those tears and words out of me, at the same time wishing they wouldn't because this is not me, they can't know. If you can't understand it, how will you ever be able to explain it? I needed someone at that moment, but I let no one in. I was failing everyone around me, and I didn't care. I'm telling you, this is not me. I care, I listen and I am there. But I didn't care, I was listening and I am nowhere near where I need to be. 
Tell me, who is this?