That was all me= I achieved all that, without any help from anyone else. It can refer to a sporting or career achievement.

This is not a very modest way to claim the praise and admiration of onlookers. Basically the speaker is saying that the result was achieved through their efforts alone. You can imagine on a basketball team, one player believes they are the best on the team and scores the most points per game, might look at the end of season trophy and claim "That was all me".

哈哈ha ,i havent got a chance to express myself ,and i dont want to say that because people will find me throug details