Hugely unlikely.
You're not saying what wheel size you have. But If its 26" or bigger a 46/11 will get someone with average pedalling technique to about 30 mph or a bit above before spinning out.
Bicycling is more about stamina than strength. General recommendation is to keep a cadence - pedalling pace - of 80-100 rpm.
Well, we've all been there.
Thing is to start out with a bit of humbleness.
You need a decent mileage/saddle hours before being able to tell with confidence that it's the bike that needs changing.
In the beginning you're better off working on riding technique rather than ride technology.
If you're new to riding, this might feel fast and too light.
But it is the way to do it.
No.
165-175 mm is considered the "standard" lengths for cranks, with the majority found in the 170-175 mm range.
Longer cranks will make a gear feel lighter to turn. And yours aren't particularly long.
This is a far more likely explanation. You don't know how it's supposed to feel like yet.