I don't think you've done any exercise aimed at losing weight before. Exercise depends on the interaction of muscles, bones and fascia of the body. A person has never done such a big exercise, and the body naturally needs a habit process, so it is normal to become miserable.

But you must stick to it, because only reasonable exercise, reasonable diet and reasonable work and rest time can be effective for the time being, and the aging period should be at least half a year. Of all the people who failed to lose weight, 99% failed to persist. It hurts and I'm tired, so I don't want to go today, I'm tired from work and study, and so on. Never look for these interfaces, or you will never be the envy of others.

People often envy those who have great bodies, but who would think what persistence and perseverance others have experienced to reach their present level? I once heard a fitness instructor say that losing weight is the only thing that will pay off if you persist.

So come on!