Is it normal to troll on the internet for fun?

Yes, but there are limits to it. You just gotta be aware what you troll about.

it's common but a lot of it is a self-fulfilling prophecy

I'm addicted to harassing people on the internet

As long as it's not malicious and you back off when someone is getting obviously bothered by it then there's no harm being done

Whether, or not you're just messing with people, or actually harassing them is for them to decide, not you.

That's about as normal as the day is long! 🤣 At least 75% or more of this site's content (as well as that of pretty much any open forum) is from people who also love to troll! Sure keeps things interesting!

For Internet Trolls its fun. Not for other people.

I suggest that you go live under a bridge somewhere, and forget the internet even exists.

A little but not too much. Sometimes you gotta be a little less trolly.