First masterbation due to heartbreaking dream

I was @ 6th or 7th, one night I had a bad dream,
I was trying to sleep on a floor in the then suddenly I noticed something @ my top 90° left side there is someone sleeping/... I look @ it, it was my best friend with my crush hugging together, when I look@them they noiced me , lookd at me then they continued their business.

I woke up suddenly extremely sadly[felt like a psycho]. @ that time i cant understand what to do. I just lie upside-down imagined her with my strong emotion. She slowly opened her clothes,(@my mind :yup I deserve her) i slowly hug her naked body, kiss her like i really wanna suspck her. ..... I felt something wierd. Something is coming from inside me I'm scared(because i did something wrong) i hold it inside me (I'm soo scared because I felt it like my liver). I just found out i cant hold it longer i just released it like i was sacrificing something. Ooops all wet ran over to the bathroom cleaned it and slept.
I don't understand what just happened....
I don't know what porn is/what masterbation is..
I don't believe that is normal! Or is it?
How did you masterbate @ first time?