I do not understand.

I'm having some issues since I started meditating. When I started I just did it in never did research. One omy friends just told me to try it so I did. I just closed my eyes and relaxed and clearly enought under two minutes I was seeing stuff and feeling stuff really quick that it just blew my mind from the experience. What I don't understand stand is why do I start to meditate real quick? Is it normal? Another thing was that my body keeps shaking for a while. That happen to me for a while until I surpassed that stage but now I shake and feel different vibrations and energy flow and my hands start to move as if I was practicing hand movement like the monks. My hands and arms start stretching and moving in weird ways and my body also like if someone was controlling it. At some points my body wants to keep doing it even if I'm awake not mediating or if i think about it feels like a meditated with my eyes open but why? Is it normal? I need an explanation If someone could help out if. I'm doing anything wrong. I would appreciate it if someone would guide me.