Time speeds up for happiness, slows down for sadness

I had a party months ago. Many people came, it was pretty fun, and we had a great time, but... even with that said, it all ended so fast. I barely even comprehended what the situation was before it was all over. I feel like, time speeds up in joyous times and slows down in sadness. Why is that? Is it just that we understand the joy of the situation for only a few minutes when in truth it last for hours? Then what about grief? Does life want us to be scarred more than unwounded? Right now, I look back at my childhood years, remember the nostalgia, and feel a bitter pain in my heart. I feel like it has already lasted more than the party, than that tiny opening to peace, comfort, happiness. I see my hopes and dreams, then my fears and failures, and I wonder if there is something that will happen from all of this. Will I actually do something for the world, or is my struggle just going to lead to nothing? and I wonder if there is something that will happen from all of this. Will I actually do something for the world, or is my struggle just going to lead to nothing? Questions... without answers, unless I answer them myself.