Mindfulness in Everyday Activity

I have been practicing meditation, reading and listening to Buddhist teachings and I undertake the five precepts for about year now. This is the first time that I actually ask a question about my practice. I meditate every morning and then during my daily activities I try to be mindful watching the physical and mental phenomena. I can be mindful quite well but as soon as I experience an unpleasant mental state such embarrassment or awkwardness fear and aversion come up and I feel kind of lost. It is like I forget what to do and I am not able to be mindful anymore. This happens even if I am well prepared to experience an unpleasant mental state. It happens when people are around and very fast too and even if I am not scared to experiencing them when they come up, it seems that I lose track and I forget everything. So what can I do in these situations? Sorry for my English. I hope that this make sense. Thanks for your time, may all beings be happy and free from suffering.