Is it normal i am not aware of how i truly feel?

I don't feel sad or excited until I'm in a situation that results in me reacting emotionally. For example, I won tickets to my favorite band's concert but I wasn't excited that I had won, I felt like it was no big deal. However, when I was actually there I became extremely excited and happy. Another example is when I went through a break up. I handled the situation calmly and we ended on good terms. At the time I truly believed I was ok and that I felt no pain. When I left his house I suddenly felt tears running down my face. I was in complete shock because I had felt calm just a moment ago. Forgive me for the lengthiness. So is it normal that I'm not aware of how I truly feel?