It’s certainly not unreasonable for a healthy and fit young person to put out the levels of power that you report.
Given your weight (95kg), an FTP of 299 gives you a power/weight ratio of about 3.14 w/Kg. For reference, that would put you towards the top of Cat C cyclists. (Cat A riders are generally 4 w/kg or greater.)
The other thing to keep in mind is this: Could you really ride at 299 watts for an hour straight? The ability to put out FTP-levels of power for extended intervals is often the difference between a trained athlete, and a merely very fit regular person. I know what my FTP is, and to be honest I think I’d struggle to hold that power for an hour straight.
Lastly there is the issue of how accurate your trainer is. It’s a wheel-on model, and those can be less accurate than direct-drive units. It’s impossible to say how accurate the numbers are. The ultimate test of how powerful you are as a cyclist is (at least in my opinion) comparing the numbers you get on your trainer with your outdoor, real-world performance. If you have access to Strava, you might want to find a local road segment, ride it, and see how your performance compares. (You’d need a bike computer with GPS to do that.) If you can climb a ± 2 km hill at a rate that Strava tells you is equal to about 300 watts - then that is probably the best “test” that the FTP you are seeing on Zwift is reasonable, if not necessarily 100% accurate.