How to be grateful via /r/gratitude

I’m new to the concept of ‘gratitude’. And I don’t really get it. My therapist first brought it up. And when I look at online articles for inspiration etc. all I ever see is people saying to be grateful for the small things. Like even if it’s just a cup of coffee or a pretty sunset. But I don’t understand how a lifetime of cups of coffee and sunsets is supposed to be enough of a reason to keep on being alive? Am I really going to be lying on my deathbed one day and look back and think ‘Gee. Glad I stuck it out for all those cups of coffee and sunsets.’ How can such mundane, meaningless things be enough to get you through every day? I couldn’t care less.