If he did math olympiads or computer science competitions in high school, or if he has a family member who tutored him with that kind of background already, this is completely normal.

It's the same if you're taking a foreign language in college and you have someone in your class who grew up with parents natively speaking that language.

This kind of thing happens all the time. Don't let that demotivate you. Only compare yourself to your past self. That's the only comparison that matters.

and I am too slow?

Most Computer Science graduates can't even do Code Forces after they graduate, so you're way ahead of the curve.

I was a pupil/newbie for about six months During those six months I solved about 800+ questions with a 183 day streak but my rating was more or less the same.

Then in December 2021within a span of 21 days I crossed 1600 on cf(1679 peak +520 rating) and crossed the 5 star mark on codechef

So don't worry you are improving, even if you don't see the results now. Try to improve your focus during contests and don't make a lot unnecessary submissions. That worked for me