A figment of our imagination...

You have days where sometimes you wonder why you're here. You ever go through days were you feel like you're just floating and you've left no mark that you've even existed through the day? I think that's why some people find that it's so important to be in a relationships. At the end of the day, that other person gives your day some sort of meaning. So what to those who aren't in one?. What grants you your mark at the end of the day? What grants you your mark at the end of a gloomy, rainy day? Or do you even feel the need to give some sign that you've existed throughout the day? Are some people just ok with going through days of being invisible? Are some people ok with going through the day feeling like nobody has even given them a thought throughout the day? Or am I just missing the point of life?