Become stronger before declaring the weight impossible.

A weight that is too heavy today tells you about today. Concluding from that it will always be too heavy skips the part where you could go and get stronger, which is generally available and merely slow. Most declarations of impossibility are made at the beginning, when the person making them is at their weakest point in the whole process.

Before deciding something is out of reach, give it a period of honest preparation. Six months of building the relevant ability changes the picture considerably. If it is still impossible after that, the conclusion will at least be based on something.