As you might have heard before, about two years ago when I was still in high school, I had the most INCREDIBLY VIVID AND UNFORGETTABLE LUCID DREAM EVER.

I was waking up after about eight hours of sleeping in bed, it was around 7:00am in the morning, and I was falling back into deep sleep in bed while laying on my back. Than I fell into a lucid/awake dream by accident, and everything looked starry/glittery like twinkling glitter. Just picture tossing white, gold, and silver glitter into the air and the glitter staying floating in the air as starry/twinkling energy.

To the right -- was my mom and dad standing up dreaming a distance away, where our bathroom and hallway should have been. It was mesmerizing. My mom and dad were physically asleep in bed at the time. I also saw my brother standing up dreaming to my right -- where our bedroom door connects. He was asleep in bed, too. At the same time, there was other 'beings' (not exactly "people," but walking like people) while I was watching it all for about 40 seconds. Than I woke up in bed again.

Did I see the Astral plane? Your opinions. Thanks.

I don't know. 

Since it was your experience, I can't judge it.  The way I judge my own experiences is if I was consciously there, meaning my everyday conscious thinking mind, rationalizing the experience and wondering how I got there. 

If you did not feel really consciously there during the experience, I would think it was a dream.  But that's just my opinion.

I think YOUR belief is the most important part of it.  Whether I believe it or not is not what's important.  It was your experience.  Your belief will open you up to more experiences, and that pattern will be your own unique journey.