Gambling is a game of strategy and luck, however positive your mind can get if the you lack the two factors, it's hard to win and keep a positive mindset (especially when you're losing). Also, for me I don't recommend people to gamble, maybe for past time. But don't go gambling everyday as it can be very addictive and might find it hard to let go of the habit (of gambling).
One should be positive always in life. It will help you to surround yourself with positive energy which can make things work for you. In gambling as many of the games are luck based it may be possible that your luck can become good due to positive vibes which you have it and you can win the good amount.