I always hated the feeling of the fountain pen scratching the paper while writing, but I only used it for school when I was very very young, and probably it was a crappy fountain pen.

Some of the nicer fountain pens just glide over the paper -- you can look for reviews on several fountain pen forums, and on the fountain pen subreddit. I personally like several of the ones from Pilot. Also, Sailor pens will give you feedback that feels more like a good graphite pencil (so not scratchy, but not glass smooth either). Another good option is the Pilot Varsity ones, those are disposable (and priced as such), but for something built to be cheap price they sure do write good.