what if humans had wings

Yes, I can analyze this based on bird's anatomy and aerodynamics. The wings of a bird are specifically evolved based on their body mass and flight style. For a human, assuming an average weight of 70kg, the wing size would need to be considerably large to generate enough lift.

If we look at the wing loading of large birds like Albatross, which is around 25kg per square meter, a human would require a wing surface area of about 2.8 square meters. This is equivalent to a wingspan of around 8.2 meters, considering both wings.

You are correct. Such a large wingspan would pose a great challenge in our day-to-day activities, especially indoors. Plus, our bodies would need to undergo numerous physical adaptations to accommodate for flight, like stronger chest muscles. The energy consumption would also be remarkably high.