So l saw bdsm for the first time...

So l was strolling on Twitter and l saw a bdsm page so l was curious to see what was on it.I thought bdsm was supposed to bring u pleasure but l wouldn’t know cuz l never tried it.But l saw this thing thats a part of it..sadism.And l am terrifed,shocked and scared to be honest.l am shaking and feeling like such a horrible person to be watching that.My stomach feels sick.They put needles on people and beat them and l even saw them put a type of leaf that burns when you touch it in a girls vagina.I am disgusted but l felt turned on by some of the posts.I am only a teenager,so anyone who knows this kind of stuff please write a comment to comfort me and inform me more,l feel scared!