What is Nostalgia?

Hey guys!
I honestly haven't been sticking to any promises of posting I make. I'm not perfect, but I am trying. The reason I posted last year is because I had a passion for it. To be honest, I don't think I'm really enjoying it right now. I haven't even been properly posting sine this summer. But I do want to return to daily posting. It's a cool thing, and I want to regain my passion for it.
Anyways, what is nostalgia? I know what it is. But here is Google's definition.

A sentimental feeling... well, I've been experiencing these on Animal Jam lately. Like, what happened to the days when Bloggers were everywhere? Barely any blogs exist anymore and so many people have quit. What happened to the time where I could even speak to a single friend? I can't even talk to them on here anymore. And it's not their fault. It's just that I never do it. I'm being nostalgic because I miss the days that I would play AJ constantly, talk to friends constantly, and post constantly. They're all such great memories. Why do they no longer exist? I have a feeling that it is this one reason that I have in my mind, but I don't want to mention it. I just wish I could get more moments like the older days.
I'm not saying any years are better than others. Just like Nafaria9 said, you can't pick a year that is the best until the game is over itself. But I really miss these old memories and I can't seem to get any more these days.
I will be doing other posts today. In fact, multiple school vacations are coming up, and I think I might really return to the Blogger community again. I just need to post and stop procrastinating at night.
Until the next post, then, I'll see you guys later.