Why is it that when he and I open at the same position, he can hold it while I cannot?

Why is it that when he and I open at the same position, he dares to take a large position while I only dare to take a normal position?

Why is it that when he and I open at the same position, he can exit in time while I end up losing?

Why is it that he dares to open at this position while I do not, and only dare to observe?

Comparing operations without comparing capital size will always show that there are those wealthier than you, as well as those with smaller capital size but performing better than you.