Why can others do it and I can't? Am I really a loser?

You are definitely not a loser! In a way, others may have done what you can't do, but in some ways you haven't discovered it, and it is more likely that you can't do what others do. Don't deny yourself easily, work hard, surpass yourself and become the best yourself, and don't compare with others, because it is impossible to concentrate all the advantages of others on yourself.