I've just woken up because of having a nightmare. What does it mean?

Last night I went to bed on eleven and I've just woken on five because of having a nightmare of being alone during recreation. Although I wanted to be part in it, I missed the instruction, so I took an action completely different from what everybody did. When I woke up, I said, "What was that recreation for?!" Is this a sign that I'm lonely for not making any friends, which I don't make them in real life?