Yes, it is possible to increase your mass without increasing your weight or floating in the air. Weight is a measure of the force exerted on an object due to gravity, while mass is a measure of the amount of matter in an object.
To understand how this is possible, we need to consider the difference between weight and mass. Weight depends on the gravitational force acting on an object, which is determined by the mass of the object and the acceleration due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 m/s². So, weight can be calculated as the mass of an object multiplied by the acceleration due to gravity.
If you were to increase your mass while remaining on Earth, your weight would also increase because the acceleration due to gravity remains constant. However, if you were in a different environment with a lower gravitational acceleration, such as in space or on the Moon, increasing your mass would not necessarily result in an increase in weight proportional to that mass. In those situations, you could have a higher mass without experiencing the same level of gravitational force, allowing you to float or feel weightless.
In summary, on Earth, increasing your mass will result in an increase in weight due to gravity. However, in environments with lower gravitational acceleration, it is possible to have a higher mass without experiencing the same increase in weight and therefore float or feel weightless.