Yup. There's a massive difference between sexy erotic "choking" and actually throttling someone.

Yes if your partner is into it they will probably say they want it harder, but especially if you don't know your own strength, you need to know there's a line you can't cross.

I wouldn't recommend serious breathplay unless you actually seek out legit BDSM community, but harm reduction advice here: a "full choke" where your breath actually catches in your throat should not last for more than a second, and then immediately check-in by loosening your grip and looking for a consent refresh.