Both sides have their points: some don’t believe, and others do. We just need to respect each other and never say it’s impossible to be profitable in gambling, because if you think that way, maybe gambling isn’t for you.
Not starting your gambling with the right mindset is already a wrong way to start gambling. You shouldn't think that you can't win or you won't win. What you should be thinking is that you're going to win but still as you think this, you should be realistic so that you don't make mistakes because when you aren't realistic, you'll be thinking you can do extraordinary things as winning millions of dollars with mere cents that you're using to gamble.
Although things like that can happen but they aren't common but happens once in a long time. First you should be looking for how you can make few profits and after you have gotten those then you can begin to aim higher. Having the right mindset is vital for all gamblers and can be the start of your profits or losing streaks while gambling.