Yes, mass and weight are two different things. 

Weight is the force exerted on an object due to gravity, and thus varies with gravity. So, your weight on Earth is different than, say, your weight on Mars. It's important to note that gravity can vary slightly even in different locations on Earth. Pounds are an example of a unit of force (which is how weight is measured). 

Mass is a measure of how much "stuff" is in an object. Your mass is the same whether on Earth, on Mars, or drifting through space. Kilograms are an example of a unit of mass. 

In summary, the two concepts are tightly related, but distinct. Your weight is directly proportional to your mass, but weight is also dependent on the local gravity, whereas mass is not. It's also important to note that variations in gravity are negligible in everyday life, so the two concepts are often used interchangeably in casual settings.
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