manny pacquiao takes on floyd mayweather in $ 300m mega-fight on may 2 .
filipino boxer says he will fight like it is the last of his life in las vegas .
pacquiao has no doubt he will be the first to beat mayweather .
insists he will be a warrior in fight and will look to win each round .
floyd mayweather vs manny pacquiao : wbc unveil $ 1m emerald green belt .
floyd mayweather ` is a control freak ' , slams pacman 's promoter bob arum .