Is it normal to have a vivid dream about a guy you barely know?

This really isn't that big of a deal, but it's very strange to me. **Warning: Long post. Sorry.*

This guy is in my math class, and I've never talked to him (or ever had the chance to, really). He's friends with A LOT of people, including some of my friends (which is kind of surprising, being that I'm not friends with that many people). At first glance, he seems like a class clown and a flirt. I mean, I think he's definitely a flirt. He talks to girls in a certain way (trust me, I can tell!). Sometimes he looks at me in a "certain way" or just looks at me and I just look away or ignore it (I'm a really shy person, definitely not a flirt haha).
But....he's actually really smart! He does really well in our math class, and he did really well on the SAT.
BUT......on his twitter (yeah, I know...internet stalking) he talks about girls, boobs, the works. He has school spirit...blah blah. Just random things that I don't think I would never like in a guy if they talked about those things.

Getting to the actual dream:
Apparently we both have liked each other (not exactly sure how long). All of my friends think that we look cute together. One day, I'm walking and my friend tells me that he's waiting for me at the front entrance. I could feel the embarrassment and butterflies. Once I got to the front entrance, I tried to avoid seeing him first so I went to the bathroom close by. When I opened the door, I figure out that he's sitting IN the women's bathroom. I then slowly (but awkwardly) back out of the bathroom and say, "what are you doing here?". As I turn my back towards the bathroom door, I feel him hug me from behind. His face is pressed against the back of my head. I could feel my hair being smothered by his embrace. He mumbles something, but it's muffled in my hair that I can't make out what he said.
Because it felt so real, I couldn't help but feel really weird inside because I know that we actually don't know each other in real life.
The dream continued where we were just talking, but I zoned out because I was still shocked about what happened I guess.
Then I woke up.

This is the first time I've ever had such a dream that I can remember so well after I've woken up.

What do you think this means? I think he's kind of attractive, but I don't know about how he's such a flirt...also I've never even talked to him!
I don't fall for guys easily...I'm not the type of girl that just goes out with guys, whether or not I like them or they like me. Shyness...ugh.
This is just all so weird for me...I don't know what to think.
I probably won't even be able to look in his direction anymore.
Please let me know what you think, because I'm lost.

Thanks. :)