Actually its normal and you just have to meditate at that time and take a deep breath and just remember yourself that your goal is more important than anything else and remember this feelings will pass soon you just have to keep going towards achieving your goal and If you will think more about this type of emotions you will keep on indulging in it and if you will ignore it because its normal than you will start thinking more about your goal ,you can actually try out some motivational songs at that time to get your focus back and winners are not those who never face problems but they are the ones who overcome it to achieve something big in life